A new area opened up that lets us level up to 12.0. It's called Dead Man's Shadow, and it's located where Stoocie used to be. You need a bloodstone gem or amulet to get in; the gem is in the cash shop, but the amulet is marketplace only now, since it was available only for a limited time.
If you were around for the H2k9 event with vampires and werewolves, it's pretty much the same thing as fighting through the monster nests, except it's much harder than it was back then and there are a few new enemies and... a brand new boss and set of quests.