If they're changing the ride experience, I don't see them going with a floorless B&M. First of all, there's a floorless B&M 3 miles away (Kracken), second the track is the same size, so the work to convert from a sit-down to a floorless shouldn't involve major track replacement (largely work in the station to put in the retractable floor). If they're just replacing some/all of the rails (which is also a new thing to me that I've never heard of that happening before, generally, they just replace an entire segment of problem track...very educational to hear about that!), that tells me they're just doing some maintenance to the ride. If a new experience is coming with new style trains but they're not replacing the actual track itself (so no Flyer, in other words), I'm wondering if they're converting The Hulk to a wing coaster?
Spitballing here.