Peter goes into the future and gets Sylar's power, because on this show: it's always all about Peter. In the future, Peter gets Sylar's son killed, causes Sylar to incinerate a town, kills Nathan and has forgotten all about the trapped in time Caitlin. Meanwhile Mohinder has gone bad (nobody notices or cares), Tracy discovers that she, Barbara and Nikki were triplets artificially given powers and Hiro and Ando continue to be boring.
This was good But why is the future always blue tinged? The flying people were a cool sight. What sides were chosen? Why did TPTB find it necessary to sex up Maya? She's not exactly mourning her brother is she? When did Maya learn English? Sylar being domestic with a son (called Noah!) and Mr Muggles was weird. Who was the mother? What did future Peter do? Matt and Daphne? How did that happen? Why did Daphne knock on the door if she was dying?