Natashio, you are being part of the unwinnable game for a developer.

Make lots of content in the same vein as the original game? People complain there's no new stuff.
Make lots of radically different content? People complain you're not being true to the game's history.
Make too little content? People complain there's nothing to do.
Make too much content? People complain they're overwhelmed.

The way I see it, Heavensward adds a lot of new story, new places to explore, new crafts, new stuff to gather, new raids at endgame, and so on. I'm curious, though; what are YOU hoping it will contain that will make you buy it?