I think its a bit up in the air still. Since the game is still in beta, and the pre-order characters (which carry over to launch) are level capped, I don't suppose there is a lot in terms of end game material at the moment. Keep in mind this game has not even launched yet. As I recall in WoW (using WoW as example since your sig indicated you play it :P) there wasn't much in terms of endgame when it first came out, but a lot was released over time, as I expect it will with this game. This seem reasonable since presumably not many people are going to be at end game that soon
Of what I've read the developers have been hinting at the content, so you may want to check out the dev posts on the official forums for further info.