Being optimistic, Steel Curtain is going to be an S&S coaster and it looks pretty good! Maybe they might take hints from RMC as they apparently have with Steel Curtain and introduce some hantime and airtime in there. It sounds like SFMM wants this to be their answer to a Top Thrill Dragster-style coaster, which is where the hyper rumors have come in.
Speculation: Duel coaster with two top hats next to each other, but as an inversion as opposed to a hill, followed by a few inversions. Ride time would be no longer than 25-30 seconds. This has SFMM written all over it. They can boast the world's tallest inversion at 200 ft.
*Sigh* This sounds like it will be another short, gimmicky coaster, but I'm sure the GP will love it. I don't think a proper megacoaster will ever happen at this point. An airtime machine just isn't fast, "loop-de-loop" or "scary" enough for the GP, right?