Guild Wars 2 doesn't have an endgame, it has an fullgame.

Seriously though, it will be interesting to see what new features we'll see. I'm one of those people who don't really view "x new raids/dungeons/zones" as meaningful content, it's just more of the same often. What I want to see is new game systems, and by that I mean things like grouping-tools and other things that enhance the core of the game.