People are reporting there is airtime in the back.

I only rode the front. Time was at a premium. In fact, I only rode Son of Beast and then Beast, then left the park.

I rode it Wednesday night in the second to last seat and the front seat. You get some airtime in the back not so much in the front. While I like the airtime I really like the front because of the rush you get going down that first drop. I waited about 25 minutes each time. Maybe a little longer for the front.

I rode smack dab in the middle of the train. You had a lot of floating air time going down the hills, but in a lot of sports you could tell it WANTED to give you air.

so how are the new cars? Bigger or smaller than the old ones?

As has been said numerous times, the interiors of the cars are larger than the Premier train ones were. If you've ridden Villain, Twisted Twins or any other Gerstlauer train equipped coaster, you've experienced those interiors. If not, you will have to ride for itself and see!