First off, on the Capcom side, say hello to Megaman X's buddy, the Z-saber wieldin' Maverick Hunter - Zero! Check out the video from Gamespot!
And on Marvel's side, we got another Jade warrior, and it's Bruce Banner's cousin, Jen Walters... aka She-Hulk! Here's the gameplay video from IGN!
Marvel Vs Capcom 3: Fate Of Two Worlds is due next year!