Managed to sink a few hours into this yesterday - very impressed.
A couple of questions for people in the know though:
Do we know if this will have "instances" in the MMO sense? I liked coming across bosses in the DZ but are there more traditional dungeon type experiences planned?
Will there be missions and events in the DZ (like in the normal zones) or is it just NPCs and people in emergent, player driven stuff?
They're being very vague on "endgame" content for some reason.
The story missions seem to be the dungeon equivalent. They've mentioned an endgame 'challenge mode' for them, in addition to the hard mode that's available for the Madison Square Gardens mission in beta, which should be available for all of them at release (and I think the hard mode scales to player level, so should be useful all the way up to 30).
There are rumours about larger-group raid-style stuff too, but nothing concrete yet.
As far as DZ stuff goes, they've talked about there being activities and events in there, but again, nothing very specific yet.