Preview clip of the upcoming season 4 of Heroes have been shown during the Comic Con:

Heroes Season 4 Sneak Preview from Comic Con

Incredible fight scene showing Peter (Milo Ventimiglia) vs Edgar (Ray Park)
Robert Knepper will be in heroes Season 4! How awesome! And the gorgeous Ali Larter will back! Damn, now, I’m dying of impatience to watch Heroes Season 4! But just hope that it won’t all be about Scylar…
:)