Well, what I've gleamed off the preview for the next episode is that Hiro's going to meet his future self (the one with the goatee).
Hopefully Peter and Mohinder don't die...
EDIT: Also, I was rewatching the episode "Hiros" again and I noticed that future Hiro says to Peter "You look different without the scar."
I bet that scar is from when Sylar...you know...tried to take Peter's powers (to put it in a clean way) at the end of last episode
