I agree with all of you and hope the game ends differently but I just read an interview with Torres and he implied that it ends where Vader is captured - hence "their Empire Strikes Back".
How he's captured in the GN is simply, he and Starkiller are fighting - after Starkiller thinks Juno is dead - and Starkiller overpowers him and is about to kill him when Kota stops him and says "he more valuable to us alive" blah, blah.
Starkiller relents and runs to Juno's body only to find she is still - miraculously - alive! They embrace, kiss, rah,rah,rah as Fett has Starkiller lined up down the barrel of his sights but decides not to pull the trigger because he yearns for the love they feel... Oh, yes, it's that bad!