We will find out in August. Will it be the wondrous monster everyone wants? That's where I have my doubts. My guess is it's gonna be a fuel gimmick offering. Yes, 909hp because E85 will make it possible without any effort. Stellantis is ok with this type of FE because 0.00 research and development is involved.
That won't stop them from asking 125K for it and (many) people falling all over themselves to get one (mostly because it will be worth 250K as an insta-flip due to 250-500 units being available).
Hey, don't shoot the messenger. I'm just here to keep things real, lol.
PS: ADM's abound...
Edit: I will make one more prediction... Even if this ends up being built as a "Demon with E85" (i.e. all Demon features) it won't be notably faster in the 1/4 than the Demon, despite the apparent HP boost. This is largely due to the fact that real HP at the crank for the Demon (based on real-world dyno pulls) is already close to 900hp (not 840). So unless its a 1000hp offering, I'm betting this really will amount to a cheap, last-hurrah money-grab gimmick (and gift to greedy ADM dealers) by Stellantis.