Something we're super happy to see being added here at Massively is 'Crossover' missions -- or shared missions for grouping. The feature will enable players to share missions with their teammates regardless of whether their teammate isn't eligible for or has already completed the mission. Most importantly, a hero who completes a Crossover mission earns their own separate mission reward. This is a big win for players wishing for a more socially positive experience and we can't wait to try it out ourselves.
For the future, Cryptic is working on "Flashbacks" that will allow replays of a previously completed mission. A new repeatable Lair is in the wings that reportedly features some "very special" villains, including one that's going to shock us. Also, power balances! Yep, more of these are coming soon -- but that's all we know.
Finally, the big hint of far-flung future content! It's not much but we've now got official confirmation that a December event is coming, followed by a "big surprise" in early 2010. It's as vague as could be, but it's at least nice to know several things are in fact coming soon. Let the speculation begin!