Might and Magic Heroes Kingdoms, a Civilization-type title. We've been tracking MMHK since this year's E3, and recently MMOsite.com grabbed some facetime with Ubisoft's Chris Early about the game. (Note that this isn't the Heroes of Might and Magic Online that's also nearing release.)
A browser-based title imported from overseas, Might and Magic Heroes Kingdoms encourages players to slowly build up a city (and later, cities) and interact with their neighbors. This can take the form of peaceful resource trading, hostile skirmishes, or large-scale strategy. While MMHK is set in the Might and Magic universe, the game differs from Heroes of Might and Magic's playstyle -- for example, combat is automatically resolved instead of turn-based. One of the most interesting features of the game is that it has a six-month cycle, after which winners are declared and the server resets for another grand struggle.
The interview spends a bit of time prodding Chris Early about the advantages -- and potential imbalance -- between free players and those who drop cash for advantages (such as more cities to control). Early claims that while paying players will have more options available, free players are still a significant force, especially if they specialize. You can read the whole interview over at MMOsite.com.