Publisher wrote, that it won't be until all the backers get their copies.
According to updates, sending is almost done so I think it won't be long till the game it's going to be available.
Yeah, US KS backers were last to receive theirs and it seems like most of them have them now. The devs seem keen to move into the retail phase judging by their updates so I think you should see it soon. The quality is VERY good by the way, not at all like the disappointing Dungeon Saga.