I've also received what is probably the same information you have via PM and texts from various different people about where this originates, at this point I think it's spread like wildfire via PM and quite a number of people know and are telling others who are telling others, but putting names out there publicly (even though, they're kinda out there) such that they can get in trouble is a bad idea.
I don't know if I'm risking a ban for even mentioning this, since I assume this is the same information the mods got because it seems so many people have it, but to be clear I'm not claiming to be an insider nor passing an evaluation on this information making it more or less likely that MvC4 is happening. Not just because I want to cover my own ass here and don't want to inflate people's hopes of put a carrot in front of them, but also because I really don't know and am not one to vet. Also, don't PM me asking for it.
Y'all are just making me go --_--