Hazardous Software has unveiled Achron at GDC, a real-time strategy game not to be confused with Archon. The official Achron Website is online, offering a couple of movies to demonstrate the game's most fascinating promised feature of time travel, though they have not yet taken advantage of this capability to tell us when the game might be released. There are impressions of this on Rock, Paper, Shotgun, and here's a bit from the announcement:

Designed to reinvent the real-time strategy genre by allowing all players to travel through time, Achron is a futuristic science fiction game. Players and units have the ability to jump to and play at different times simultaneously and independently. Time travel is free and unlimited but it costs energy to change the time line. Players will be challenged to invent new strategies in a world where it is possible for them and their opponents to undo mistakes, change a strategy after committing to it, and alter the outcome of past battles.

Time travel transforms the strategy game landscape, stated Christopher Hazard, president and cofounder of Hazardous Software. It opens up new dimensions of strategies and gameplay. For example, imagine being able to see when and where your opponents are going to attack before they do.

Achron features both a captivating single player campaign and an online multiplayer mode. In addition to being able to build, expand, and attack as in typical RTS games, new mechanisms such as command hierarchy and smart-idling ease the management of a complex time travel environment. An intuitive user interface depicts events in the past and future allowing the player to navigate the time line.