It's wierd that Peter has a scar though... I thought he got the scar because he had never met Claire, but in that timeline he should have... So I wonder what happened to have caused an injury that even Claire's powers can't heal properly.

Still, I don't think future or present Hiro knows about Peter being the actual cause of the explosion, so what we are seeing in the future (except for the Sylar portion) can still become true, even if Sylar were to be stopped and killed. It also shows that Peter does explode, even with him knowing it would happen... he wasn't able to stop it, so I wonder what new meassures can be taken so that he doesn't.

There was something called the Linderman Act if not mistaken, I wonder what it was about... I didn't hear well. I liked the Nikki/Peter pairing, I hope it happens... Peter was pretty badass in the future, I always thought he was a mama's boy and looked like a pansy, but with a bit of facial hair and the scar he actually looked worth something.