I believe the new zone, Southsun Cove, opens today at 12 pm pacific. I missed the Lion's Arch DE for today, but I finally got the mailing for going to the new area. It's been fun seeing the new zone, though at level 77, I'm having a hard time surviving the karka there. I've been able to open up most of my map, but I haven't found any way into the Bakestone Caverns yet.
I'll need to go back with a few friends, I think, in order to solve this mystery since I die every time I try to run across to the general area. There are 2 POIs inside the cavern I'd like to discover. Aside from that, the new zone seems to be a large event area where several DEs are going on.