I think that is 100% what they'll be doing, it's just upsetting that they can't figure this kind of stuff out to be released in January. I'd love to see a big America 250 celebration as well. Someone either here or in one of the Facebook groups claimed that a higher-up or spokesperson said this will be the last year for Carnivale, but I think it'd be easier to revitalize the entire event (while keeping the name and theme) than to bring in a whole new one. I saw someone else say that Kings Island just brings the same back every year; but isn't that how seasonal festivals usually work at regional parks like Kings Island?
As for the Passholder Preview hours, that email said they won't be published because the park isn't open to the general public. I believe they might make it "official" on the events page. If I saw correctly, Dollywood required their passholders to make a reservation for the 2026 Passholder Preview. I don't think that's what Kings Island should do, but they do need to find a way to make it less hectic and/or bring the crowds down. Maybe only have it open to those who purchased their pass in the first month of sales? That would make it more exclusive while rewarding those who purchase early.
The Bands In Residence concert series would be very as long as they don't take away from the existing entertainment to do it. KI needs more entertainment offerings, not less. Bringing back stuff like the races and some exclusive events would be easy money for the park.