Over the weekend, NCSoft filed a trademark application for the name City of Heroes 2. No other details are available on the plan were released/revealed, although I've put in a call to NCSoft, and they said:
“City of Heroes is a flourishing franchise and continues to be the world’s most popular super-powered hero MMO. While we cannot comment on City of Heroes 2 at this time, NCsoft is proud of City of Heroes’ success and is looking forward to future product launches associated with the franchise, including the City of Heroes Going Rogue expansion scheduled for release this July.”
The original City of Heroes came out five years ago; the super-heroic MMO has been successful enough to keep going, and a number of add-ons and expansions have been released.
While the world of the super-hero has been explored in a number of MMOs -- Champions Online, City of Heroes, City of Villains, DC Universe Online (to come) -- I don't think anyone has really nailed it yet. Here's why: MMOs and super-heroes are incompatible.
The thing that makes a person a hero or a super-hero is that he/she is better, stronger, more honorable, more-likely-to-have-armored-skin than normal people. In an MMO, everyone is a super-heroic, so and therefore, no one is a superhero, except the NPCs, and, really, who cares about NPCs in an MMO?