Yeah, that's the pic I was talking about. Now, there's about a half-second where the cheerleader is there without Peter, so I could be splitting hairs on this, but I remember watching this scene and thinking back that the picture only showed Claire, and wondering if the difference was significant or not.

We shall see.

future Hiro said "You saved the cheerleader, but the bomb still went off" meaning something else still needed to be done, but since Hiro skipped past it, it still happened. Of course, part of that "something else" is killing Sylar. So maybe Sylar does attempt to nuke the city and Hiro stops him.

Agreed. I really wonder if there are significant differences between the comic book that Hiro has at the beginning of the series, and the one he has now...i.e. killing a man (presumably Sylar.)

Also, at the end of the last episode, Sylar looks at the city and says "boom". Whether or not he is the one that blows it up, he certainly appears at this point to show intent to do so, if that makes any sense.