I saw a post on the anime Facebook page that season 2 was confirmed. However, I can't remember how long ago that was. (The post was really just an image with white text saying Season 2 Confirmed).
I know that sometimes anime seasons go for 20+ episode and sometimes they go for half that yet have a second season that goes up to episode 20+. And since the 25 episodes of Sword Art Online have covers 2 games, I am wondering, is season 1 all 25 episodes or is the 25 episode actually 2 seasons (each season being a different game)?