Marvel just announced today on their panel that the Classic 90's arcade game of "The X-Men" is coming to the home systems via PSN and XBox Live with 6 Players online play.
No official availability date yet except for "soon".
They also talked about the new Thor game for next summer and how it has an original storyline just like the Captain America game will have. This is good which will keep them from being restricted to what's in the movies.
This was also stated about the Cap'n America game:
"In the game you fight: Red Skull, Arim Zola, Baron Strucker, Madam Hydra, Iron Cross (Nazi Iron Man) and the big boss hasn't been revealed yet, but there is also a mystery character who is "neither good nor evil"
There was talk about the new Super Heroes Squad game and mention of DLC for Spider-Man:SD (Cosmic costumes will be downloadable this month)
I'll post up the Magneto and M.O.D.O.K. gameplay videos when they pop up online.