I really wasn't expecting future!Nathan to turn out to be future!Sylar. It's rather frightening to think about how many heroes Sylar must have killed. Judging by the powers he showed when he was fighting Peter, I'm guessing that he killed Candice, Nathan and Ted, and we saw him kill Claire. But! Since he killed Claire he now has the power of regeneration, which means that future!Peter won't be able to defeat him. Eventually, Sylar will kill Peter too. :[
I kind of liked the idea of Sylar keeping Mohinder around as his advisor and best buddy for five years. Complete with the Nathanesque shoulder touches that the real Nathan usually only uses on Peter. Oh Sylar, you strange boy... It's twisted in a way, considering that Sylar killed Mohinder's father.
I hope that one day we get an all-out, on-screen throwdown between Peter and Sylar. The small bit that they teased here looked good. Oooh...next week is the SylarPast!episode, isn't it? The one that allegedly might change our feelings about him? Neato.