All in all a good episode! The biggest debate between my friends is figuring out if Sylar and Peter really dead. The argument for both of them being dead is mainly from a writing stand point, as both are very powerfull and the show could degenerate to a point where Peter solves all the problems or Sylar creates havoc with their continually growing powers. Which would lead to a yawn fest of formulaic plots or contrived situations, requiring others to save the day or villans that Sylar isn't interested in their powers. The weak point in the argument is that Peter did survive the blast in the alternate future, so why not this time around?
As for Sylar...

Nathan could concevably be alive if he flew away from Peter before the blast...
The new villian Molly mentions (the one who is 'worse' than Sylar) will be interesting to see especially how/why Molly knows him/her.
As for Sylar...
I was thinking the same, and expecting him to do it. Maybe he was going to and then Sylar pushed him before he saw the opportunity. More than likely it's done so we could ask "Is Sylar alive?" for the next 4 months isn't it a move rule to always kill the villians twice?I was a bit surprised as hiro was in a perfect position to swing and decapitate sylar as he slumped over and fell
Nathan could concevably be alive if he flew away from Peter before the blast...
The new villian Molly mentions (the one who is 'worse' than Sylar) will be interesting to see especially how/why Molly knows him/her.
Well at that particular moment I'd have to say... yes. But the future Hiro we saw in other episodes sure looked it.Stray question. Is bad ass Japanese for constipated?