I think it’s safe to assume that the 5.2 raid will involve The Thunder King, and will take place on the island northwest of Pandaria. In a recent interview with Convert to Raid, Ion Hazzikostas said that 5.2 would contain a large and more traditional raid tier, since we haven’t had a large instance since Ulduar and Icecrown. So it’s sounding like a single, large troll/mogu instance.