I'd like to throw in my 2 cents (or 2 dollars worth due to the length of this post) for trying to decode this thing and put some sense back into this topic.
Okay, first of all, lets not forget what this ride is replacing. A ride as big as Son of Beast coming down with the following it had (hence the sale of the SOB parts) might call for a coaster of a similar stature, and given the fact they started pretty early is an indication that this will be pretty big, which to me, rules out an Intamin Blitz or anything of that nature. Also, Kings Island needs another line chewer.
I'd like to pull out physical evidence at the park for this and not go by Don's Twitter speils or anything else of that nature (including the signs on the fence, owls and scarecrows) and no looking at silly things like footers shapes or bolt patterns (all steel coaster manufactures share those things with each other in one way or another).
So we have footers in a big square shaped pattern on the ground, which indicate a likely spot for a train shed. The train shed, at least how I see it, is that rectangle consisting of footers in a pattern 4 across by 3 wide. The 4 footers which outline a similar size square to the shed's would probably be the transfer track area. Next to that are what most people see in the paired footers lined up next to them. The reason I bring that up is this would be the section with the final brakes. I would like to compare those with Diamondback's for a moment. Diamondback has alternating single and double footers. This one has all double footers at the specific final brake area (and likely station) which to me, looks like it'll be for the A-frames of an inverted coaster. I'll give some people the benefit of the doubt there as the land might be where it needs double footers for track with the train above the track, I.E. a standard sit down coaster, which given what this is replacing, give the impression of a giga coaster.
I don't get anyone thinking there will be the turn right next to Delirium with the lift right next to Sling Shot. The footers don't indicate a lift of any kind, and the fact there isn't a room for a lift anyhow there (yes, I'm saying lift, I don't think this won't be a launch coaster). The lift would end up going extremely close to Sling Shot and over Adventure Express' entrance or out into the Oktoberfest lake at that angle, which you couldn't put a first drop from a giga or an inverted coaster there (or for any type for that matter). I'm fairly certain the station will be in the gap between Adventure Express and Flight Deck, whereas it'll have a final turn or something coming behind Delirium. The lift would go out behind Adventure Express or somewhere into the area where Son of Beast used to be (there could be a turn before the lift, Leviathan has a turn between the station and the lift, too). Heck, with the station that high up, they could pull a Hydra and put a pre-lift inversion there.
Also, to the giga speculators, I have to ask you at this point; where is the clearing outside the Son of Beast area? They've only been working in the old Son of Beast spot. Do you guys realize how much room a 300+ ft lift and drop takes, even if its a curved drop, not to mention the rest of the layout? Go take a look at any giga coaster and see the distance from the base of the lift to the bottom of the first drop, including on steeper hills like I-305 and Millennium Force. You'd have to have the bottom of the first drop WAY at the end of the old Rose Bowl section, and from there, it'd probably have to go behind X-base or behind Flight Deck (I'm not sure how much land the park owns between FD and GWL). Even a compact course like that of I-305 would take a HUGE amount of room, probably surpassing SOB's old footprint. That's just after the first drop. Giga's also average around a mile or more of track spread out over a pretty large area to burn off that speed (90+ mph). You'd probably need track all the way out by Dinosaurs Alive to accommodate such a monster. Right now, there's no extra clearing around the perimeter of SOB's old grounds. I'm seeing it that the project will be substantially smaller than what most people are expecting, at least not to the scale of a giga coaster. With an inverted coaster, you can get creative with inversions as turn-arounds that use less space than that huge hammerhead on Leviathan or the massive overbank on Millennium Force. Cobra rolls and immelmans take up much less room, plus if you want any evidence of a large compact inverted coaster from B&M, look at Pyrenees. 147 ft tall, 6 inversions, over 4,000 ft of track in a pretty tight space.
I know there are other manufactures, but frankly, I look at their current products and most of them don't have things that meet something that would fit Kings Island at the current moment. I get the feeling Kings Island wants to stay away from prototypes given the trouble they've caused the park in the past. Some have new stuff that could work, like Intamin's and Vekoma's new 4 across seating, Mack starting to build bigger with new train designs, Mauer Sohne has some neat spin off's of their X-car, but most of that stuff either hasn't been tried or hasn't been used a lot, which Cedar Fair generally stays away from. Gerstlauer doesn't come to mind as most of their designs are more compact than what we're seeing at Kings Island. But even something as big as Takabisha @ Fuji Q wouldn't have the capacity Kings Island is looking for. Premier has made a comeback recently with the likes of Sky Rocket, Superman and Full Throttle, but with my thoughts that this won't be a launch coaster (Premier's bread and butter right now), I don't see them either. S&S is ruled out as aside from launch coasters and 4D's (which they layout doesn't indicate, most are clones of X2) they're really small (Steel Hawg at Indiana Beach for example) and again, are newer designs. Zamperla or Pinfari- no, just no. That leaves B&M and Intamin, which the only Intmain I see is a giga (though they do have a full circuit inverted design, but only 3 have been built, a looper like Thorpe's Colossus would be too redundant IMO with Vortex doing its thing) and with my thoughts on the lack of clearing, I'm ruling it out. With that said, I don't see this as a prototype coaster in any way, shape, or form.
So let's narrow down B&M types. I'll rule out flyer and sit down looper since Kings Island has both. Stand ups are a REALLY dead type, so that's out. I'm going to trust in Ouimet's words in his interview on Gatekeeper's opening day and rule out wing coaster. I'm not convinced with the lack of clearing so I'm ruling out giga. That leaves inverted, floorless and dive coasters. I'm ruling out dive coaster as the footers in the area behind Sling Shot looks too compact for a 8-10 wide car to maneuver through, plus the elevation changes concern me as dive coasters run out of momentum quick, so I tend not to lean on dive coaster. I think floorless is a different enough experience from Vortex to work. Being exposed like that above the track compared to Vortex's tight confines would be a pretty unique experience. Kings Island is also one of the only park's of its size without a full circuit inverted coaster (which I'm surprised KI didn't end up with a Vekoma SLC instead of Invertigo), which I keep that option open as well.