Okay a couple things first. Yes I know there've been a lot of rumors like this for YEARS since MvC2 was released.

Secondly, I know I participated in a recent AFJ here on TFF, I assure you, that was a one time deal and if this IS some kind of late AFJ, I'm not in on it.

What makes this credible? This is a "leak" by the same person who revealed with 100% accuracy Capcom's Super Street Fighter IV ROSTER AND ALL before they officially unveiled it. So, it's looking very possible.

Plus, Capcom's recent positive comments regarding TvC's and MvC2's sales plus they've already got an engine and models they could use from TvC seem a new VS game of ANY kind seem very plausible.

More info here on the story behind the leak:
Marvel VS Capcom 3 + Super SF4 PC | Team Spooky

Have fun speculating kids