The guy who leaked it over on GAF allegedly has a solid track record. Supposedly everything he's leaked in the past turned out to be true, so I wouldn't bank on this one being debunked. If it's true you can count me out on this game. I disagree with having diversity for diversity's sake, but only 4 female characters is admittedly not a good look.
Funny you should mention the lack of diversity, I'm concerned about the lack of diversity from both Capcom and Marvel in terms of represented properties. It's entirely understandable not to have X-Men because Marvel does not want to promote characters that they don't have movie rights to, but this is literally Avengers + Guardians of the Galaxy vs. Street Fighter + Mainstream Capcom Characters.