Pretty much anything related to Meteor and the Empire storyline will be gone or revamped for 2.0, since the current Meteor event is going to be 2.0's backstory. This includes the current Main Storyline as well as the current Grand Company storylines and some sidequests. Also, the primal fights (Ifrit, moogles, and Garuda) and the current dungeons are going to be revamped and have their rewards changed as well.