I would imagine they won't change much of the current queue, save for a new pre-show with the Aly San San droid. The queue can be rethemed later if they ever do add 'Star Wars Land Lite' to Discoveryland. Then it might get more of a detailed makeover along the lines of what is being added Stateside.
As bad-pink-tink said, the main change for now will be the upgrade to the Starspeeder 1000 model, which will add the 3D projection facility and the removal of Rex. And if we're lucky some new seats.
So looking on the positive side, it'll be a refresh of a now tired attraction, with the potential to be upgraded further in the future.