Before anyone lets their imagination run too wild, I'll remind you that this discussion is all based on hearsay.
I don't think there's any reason to do a launched B&M invert. The B&M invert design is fun for tight elements close to the ground, but otherwise it encapsulates riders so much that it spoils some of the effects of a launch or high speeds. Plus there already are launched inverts from other manufacturers, so it wouldn't be anything specially marketable. Also, both WOF and SFStL have inverts, so I was assuming it was off the list for SDC.
^Wildfire was a standard sit-down with special prototype "stadium-seating" trains. I think the trains are standard for them now? I think Hulk is either getting them or floorless trains...
I don't remember why the rumors are gravitating towards B&M, but if that is indeed the manufacturer, nothing in their catalog really seems to "fit" the park right now except the wing coaster and the flying coaster (seeing as they are already looking at a Dive coaster separately). As I'm sure we've discussed before, a flying coaster should be really marketable around here seeing as the closest installation is in Chicago and there are lots of opportunities to make it interesting with the landscaping and theming. Wing coasters are also visually interesting and are practically made for fly-through theming, but at the end of the day it wouldn't be all that different than Wildfire...