[UPDATE] Dammit I hate it when these things happen but The Hollywood Reporter's Lesly Goldberg tweeted this:

So maybe it hasn't been cancelled, however a lot of TV outlets are saying as such so its back to being a maybe. I should probably just delete this post.

IGN is reporting that Revolution has been cancelled by NBC. Can't say I'm surprised since this show hasn't been doing good in the ratings and have not seen anymore recaps from io9 or any of the TV sites I frequent. This might be the first time that there isn't a JJ Abrams show will be on slate for a TV season in a long while which is surprising

Source [IGN]