That was the new Nova. That's literally the only thing he's done in the comics so far, but it seems some are assuming he's the same as the Nova being featured in the Ultimate Spider-Man cartoon, who's named Sam Alexander. Not exactly the most reliable source of information, although their costumes are identical.
That's because the writing and production staff that made that first season and a half so good was almost entirely gone for those last few episodes. Loeb and Man of Action began overseeing a lot of the show halfway through season 2 and MoA wrote several of those episodes themselves.
