I am only speculating here, but I imagine when EttSC rolls, the new items that come along with it will get added to general drops, the way that any module can yield either base set or AotA items even if you haven't bought the AotA expansion. I wasn't around when AotA was released, but as far as I can tell from old blog posts, when that happened players were given a free magnificent artifact chest every day for a week to help get them up and running with the new items. If there were any other special transition measures, I didn't see mention of them. I will happily sit at the feet of grizzled veteran players and listen to their tales of long ago if they feel like chiming in. The reason I'm thinking about this is that I have some quests that I haven't gotten around to doing yet. I have all the existing commons and uncommons and all but a small handful of the existing rare items. So it occurs to me that it probably makes sense for me to hold off on doing any more quests until EttSC rolls, so that instead of getting (mostly) duplicate rares I have a shot at some of the new ones. Right?