I'm not 100% sure, but sadly, I think that both Endor Luke and Endor Vader have been cancelled. Guessing from what I've seen in those collection room photos, he was going to be a repack of Jabba's Palace Luke; not owning one I would've bought him, too.
However, this move may precipate the release of another Luke- you never know. And I have the feeling Vader was maybe going to be 500th Vader again, as the Tatooine Vader already looks to be...
Personally, I hope they make a new one in the VTSC line, but there's nothing to indicate such a thing yet. I'm hoping though, and I think there's a fair amount of demand for a new Death Star/Final Duel Luke. No one likes old "Hulk Smash!" Saga Final Duel Luke.