Wow I posted 88 times (well, this makes 89 times) on this thread! I seriously did not expect that.
I doubt there will be retroactive changes since Ame did all that in E15. Right now E16 will be completely redoing the city, and some will include 50 new sidequests (I think that's what I read). Including the Togepi quest quiz (or at least a very similar version of it).