I actually am quite looking forward to that game. That is a nice tushie
An outdated leak from a couple years ago listed it as multiplatform, but things could have changed. I wouldn't be too surprised if it is exclusive. At the very least I expect Sony to have marketing rights with the game similar to how they have with COD currently, if in the case it's still multiplat.
A lot of people want to equate SFV as a failure because it was PS console-exclusive, but in actuality it has been a pretty big financial success for Capcom and has probably made more revenue and profit for them than SFIV and its variations in their entirety. The game did have a piss-poor launch, though, and they never fully delivered on single-player content the way they could've. That and better netcode should be priorities for them.
Even if SF6 is PS console-exclusive, long as they have actually good netcode and an ample amount of single-player content they shouldn't have anywhere near the rough start SFV did, should be able to sell a lot more copies lifetime and bring in a lot more revenue & profit. But that's only assuming anything's changed since the leak WRT console status.
Though at the very least I hope the PC version is very moddable