I've been considering dusting off Rift again myself. I played it at release and had fun, but just got too busy at the time. I really liked the Chloromancer, but it had a few major issues with healing I wonder if they addressed. (IE: If you had to hide from some large telegraph move you couldn't attack the boss AKA couldn't heal the tank, making it easy for them to die in that duration. Only had 1-2 emergency heals)
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Why would they need to make a WoW2? They've shown they have no qualms about making drastic changes when rolling out expansions. More likely they would pull a Classic EQ --> Kunark and dramatically revamp the game engine with a future expansion. With how good Blizzard is at sidetracking the storyline with BS like Mists and Warlords, we'll be lucky if we see Kiljaedaen or Sargeras before 2020.