Okay time to bring this back.
Luke has become the apprentice of Starkiller, Yoda is still alive, Leia and Han are still alive. The Rebels have been decimated on Hoth, what's left of them will be regrouping going into ROTJ.
Luke is lost to the Dark Side. Leia is the only hope left for the Jedi, I think she goes to train with Yoda after Ben's spirit leads her there.
Meanwhile Starkiller will use Luke to destroy Palpatine. Maybe he will track Leia down and kill Yoda on Dagobah, setting up a Luke vs Leia final battle? With Starkiller taking the winner as his full apprentice.
Oh and before anyone gripes about giving the Hoth ending away, spoiler warning is in the thread title.