The thing that sticks out most here is the release date. No way in hell I believe they could have a MVC4 ready in time for 2017 (if this is legit then prepare for the inevitable delay).
It was about 5 or 6 months ago when Marvel announced they were getting "serious" with gaming or whatever and even had some "Can't talk about it now but who knows what the future holds?" kind of things to say about MvC. This very well could have been in development at that time. 2017 sounds possible to me.