Slightly good news, seems as though they'll be releasing at least 2 characters per month until the release (suspected March). This means at least 8-10 more characters bringing the base total to 34-36+. Also means after the 31st we may be greeted with 2 more characters (presumably 1 cap/1 marvel of course). They hint there are definitely more females and Capcom aims to use the Darkstalkers to fill most of those slots.
I hear a weak rumor that Venom is not in because their were issues making his model shape shift constantly. Has some logic to it, but no proof and the problem can be worked through, but is certainly a task for modelers to work around. This of course could spiral into Carnage and other symbiotes not making it.
There will be at least one more Megaman character (more than likely zero/megaman or both).
There will be no MvC3 original characters.
And for better or worse they're retaining tag outs as holding the assist button. I'm really hoping they give you some freedom on altering that, perhaps 2 options to choose from base on preference. I would much rather have some instant method, however the b+A1/A2 was not a viable option and I would favor the hold over this.
And most importantly it was announced "Magneto is still Pringles"