So I heard from some people that most of the game will dramatically change when 2.0 comes out. So far I love everything I have seen and eagerly await the new content. However, I have heard that the current quest storyline and all side quests will be wiped out and replaced when 2.0 comes out. Is this true? What about dungeons like "Shposhae" in La Noscea? Will they be wiped out and replaced?

I ask because I am the kind of weirdo gamer that gets really into the lore and storyline of a game and I like that MMO's like FFXI and FFXIV provide an entire world of it. However, should I be rushing to get my character up to snuff and complete the current content before 2.0 so I don't miss anything or can I relax a little?