The third piece of Skyrim DLC has a new trailer which includes ride-able dragons, a new dragonborn, and new enemies to face. While it doesn't have a release date, it'll still come out for 360 first due to the deal that both Bethesda and Microsoft have. So yeah, more Skyrim.
Stop regenerating enemies and kill a specific amount of people. Change the pace and size of the game in single player in order to give people a breather. Add vehicles in campaign and multiplayer. Add a forge mode. Set the game in the future or the past. Don't set the game in the current day.