As neat as this is, I think the potential of Hasbro vs. Capcom is far greater. Transformers, MLP, GI Joe, D&D iconic characters, Magic: The Gathering iconics, probably a dozen other properties. Ryu vs (a shrunken) Optimus Prime, Dan vs Bumblebee, Felicia vs Ajani (either one), Princess Celestia vs Akuma, Guile vs Cobra Commander, Mega Man vs Serpentor, Sgt Slaughter vs Zangief. The possibilities are near limitless. And hilarious.
Edit: Okay, I mainly named street fighter characters, they were just what came to mind.