I haven't heard anything - but there's probably a 99% chance it stays in the "theater in the round" format. I say this because it's been like this for 45 years. I just don't see it becoming a "ride" - at least one with motion. I just don't think there is enough space available there. The original "Mission to Mars" had the same circular format in that same space. Also, while they haven't officially announced this yet - I would suspect they want something that wouldn't be a 2-3 year re-do of the ride.
And if I had to guess - and again understand this is ALL guesswork - it would have to do with Hero's Duty and the Cy-Bugs. My prediction would be that the audience is being shown a demonstration of the new immersive videogame version of Hero's Duty - when Ralph enters the game and things (as they are want to do on theme park rides) go horribly wrong - but in the end maybe Calhoun, Felix and Vanelope come in and fix everything. I think this because they won't want to use ACTUAL videogames or videogame characters that are referenced in the movie since that would involve paying someone for them. So of the 3 fake games (Wreck-It Ralph, Hero's Duty, and Sugar Rush) it's really the only 1 of the 3 that really works as an "in the round" theater. Sugar Rush might make a good simulator, but not in this format.
@rteetz mention of dome projection makes a lot of sense - they could have a very "sense-around" system where the bugs are attacking. It would also somewhat keep with the theme of tomorrowland as in the "future of videogames" type storyline.
Just my 2 cents on what I would think they'll do.
