I have this gut feeling and my $ is on WDI turning this pavillion into some sort of theatre-show. Even though Id prefer a ride.
I say there are facts, MINIMAL FACTS, available now to support this.
First, if they are adding a ride, you'd think they wouldn't be fixing the roof just yet, at least not painting and stuff, because of possible expansion needs.
Second, and most importantly, the WoL showroom is arguably better set up for a theatre than it was ever for anything else they had in it. Even the dome shape of the ceiling is good for acoustics, not to mention circus-style seating that can pack the house.
Third, the BODY WARS area isn't terribly large. Unless they returned to the same exact simulator-style ride, or a short dark ride, there isn't much you can use this space for. It is however, ideal for a backstage elaborate housing area. Though I suppose one could argue that they could expand THOSE buildings, there isn't that much space left on the maps with the E-Ticket Guardians opening.
Which brings me my fourth point. Many of you have stated that GoTG is going to draw crowds and they will need something to do with them. Well, an easy remodel using the old Body Wars-wing as a backstage aream would make for a great Circus-like show that would eat those crowds for 40 min at a time.
Fifth, we should also note that there is already a small GoTG show, ill-fitting across the World Showcase, which would be easy to expand upon and ideal to open next to GoTG at UoE. Although I'd expect whatever show they'd add there to be bigger and hope it was something else... The idea being that whatever they add would be elaborate and be retained in that building for some time.
Sixth, they recently cancelled the MK Theater to "use those funds elsewhere." Im not sure I remember hearing exactly where they would be used, but given all the design elements of the WoL pavilion, its an easy, much cheaper, remodel to turn this building into a theatre show.
Which brings me to my last point- This is the one type of entertainment absent in Epcot now. You have movies, and Am. Adventure and the Am Gardens Theatre, but there is no real wow-factor stage show. When you couple that with the need to spread crowds evenly through a park with new attractions across the lake, and the fact that the building is so ideally set up for a show, it becomes a no brainer to reuse WoL as a theater.