Valve's announcement of this week's A Heavy Update for Team Fortress 2 includes word on another upcoming free-to-play weekend for the multiplayer shooter:

"The Heavy" update is the largest update to Team Fortress 2 since it was first released as part of The Orange Box last October. In addition to offering new unlockable weapons, achievements, "The Heavy" update also includes a brand new gameplay mode and a number of new maps.

The rollout culminates next Tuesday, August 19 when the update will be made available to all owners of Team Fortress 2. To give all gamers a chance to check out the new gameplay introduced in "The Heavy" update, Valve will be running a Team Fortress 2 Free Weekend via Steam, a leading online platform for the delivery and management of PC games. The Free Weekend is open to gamers the world over and scheduled to begin Friday, August 22 at 11 am PDT. For more information, please visit http://teamfortress.com/