I think there are gonna be three social areas: the two smaller ones for the Prison of Elders and Trials of Osiris, and the bigger one for the main social area in the reef, or Queen's Bay as it's apparently called.

This is actually the first thing I checked out yesterday after I got patched. The new Reef map looks a hell of a lot prettier than the old one did. I wonder where the node appears for the first time you have to visit the Reef after completing the Ishtar Collective story mission. I almost tempted to delete a character to create a new one and see what's changed there.