Quote Originally Posted by Tempest222 View Post
Well, I haven't gotten over ilevel 300 and completed Drowned City of Skalla yet, so am not even sure what's included in expert roulette. I haven't unlocked anything since a few level 50 things that weren't part of the msq, so I'm going to assume expert roulette is mostly or at least partly picking from things people had to do to get thtrough the main story quest. Imo, that's casual stuff, so my opinion is the same.
Expert right now is all four level 70 endgame dungeons. Two of them are MSQ required: Ala Mhigo and Drowned City of Skalla. The other two are optional (Kugane Castle and Temple of the Fist).

Expert changes as patches come and go, though. What's in it in 4.2 will change as they add two new dungeons to it, and some (or possibly all) of the ones currently in it will come out. Generally speaking it's "whatever the newest max level dungeons are".