from:
http://community.vugames.com/WebX?230@54.ibUjdJ7YJFo.0@.1dd80e21
Attention: at 5pm pacific daylight time FilePlanet.com will post the official Tribes: Vengeance open beta multiplayer client for FilePlanet subscribers. This marks the beginning of a three-phase open beta program that will give tens of thousands of gamers the chance to try Tribes: Vengeance's multiplayer content while giving Irrational Games and Vivendi Universal Games the opportunity to test the stability of the game and servers.
Tribes: Vengeance will ship to retail stores worldwide in early October. A single-player demo for Tribes: Vengeance will be made available in early September.