You should go play Neverwinter -- it's awesome. Right now it's in open beta, but on June 20 it will be officially released. Part of this release includes a new end-game area that will combine "PvE, PvP and dungeon delving into one epic gameplay experience," which sounds completely amazing. Launch day will also feature a big patch addressing tons of balancing issues found during the beta period.
The first expansion, called Fury of the Feywild will come out this summer. All we officially know about it is right on that page. It's going to be green, have glowing trees, and Sharandar will be under siege. It's not much of an announcement, but it is comforting to know that new content will be coming out quickly after release.