After you hit 80...
- You can still grind for legendary weapons. considering a legendary costs 200 skill points you have to be over level 80 to even consider making 1 of (12?) and max'd out in 2 crafting skills.
- You have 3 dungeons that open up for you when you hit 80 with a storymode and 3 explorable parts to it. (basically 12 dungeons).
- WvWvW pvp. Which is a huge event
- Battlegrounds (structured pvp)
- Also you can return to areas which will be challenging and finish off 100% completion,
- complete all the puzzles, jumping and otherwise (like the key quest in the asura starting zone).
Do we know when Anet will release new content? no.... but finish all that off first and then worry about grinding.