The Rebels panel at Star Wars Celebration Europe is going on exactly as I type this, but and of course the first question everyone had was about whether Ahsoka Tano survived her climactic duel with Darth Vader in the end of the season two finale. More surprisingly, director Dave Filoni actually gave us a pretty clear answer.
Source: io9 – Star Wars Rebels Pretty Much Revealed the Fate of Ahsoka Tano