A week or so ago Nova made his debut in Ultimate Marvel Vs. Capcom 3, and with that Capcom released images and info for the alternate costume downloadable content packs.
Well, I believe Gamespot got the exclusive and was the first to show them off. They also revealed a little tidbit about each.
Regarding Nova's alternate costume, the following was stated:
"This Nova costume is so fresh, it's based on something that hasn't even been revealed yet..."
And here it is (thanks to Lincoln Tunnel in the CBN Forums for the tip):