Timed to sync with the start of PAX and Leipzig, Sierra will release a rather full-featured demo of their upcoming real-time “action” strategy game World in Conflict on Friday containing demos of both the single-player mode via a tutorial, plus one mission as well as multiplayer supporting 16 players. There will be one multiplayer map available to all demo-downloaders that can also be played in solo skirmish mode and a second map playable only by those who pre-order the game. World in Conflict is designed to incorporate first-person shooter elements like speed into the RTS genre and by design requires no resource management. The game is due out September 18th.

In other demo-related news, the PC version of the BioShock demo that Xbox Live users have been enjoying since last week is out in time for the full retail release of the game. Any PC users on the fence about this game can check out the first half hour or so of the game and most likely put it down only long enough to run to the store and buy the full copy.