No content gets wiped with a expansion, everything we have will still be here it's just a new story arc will be added that will prolly be the same size as 2.0 or larger. You will still need to finish the 2.0 story to prolly have access to the expansion areas but what Nabian was saying is content that by that time is outdated ex primals ct/st will prolly be skipped by anyone just joining the game after the expansion in favor of the new stuff that will be available in the large next part to the story.