We see what the future would be like if the bomb had exploded. The future we see is one that is very corrupt and bad. Things in the new future have gone horribly wrong, as the special people turn on each other and none of them are really safe. The new future also holds a surprise, as Sylar is still alive and can change his appearance as well. Basically the new future is as bad as things can get, Peter's brother is dead and Sylar was pretending to be him, Ando is also dead as well as a lot of other important people. But the future Hiro saw was for a reason, and part of the bigger picture as seeing the future helps him to gain his powers back and have more control of them. The episode really develops on Hiro's character, and I think we are in for a big finale soon.
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