Let me start off by saying that Factions is not an expansion to the original guild Wars game. Rather Guild wars Factions is a completely new, stand alone game. This is a different approach these days with most popular MMO titles seeing expansion after expansion. GameSpot has an interesting Q&A with James Phinney and Eric Flannum, the designers of the game. The publisher of the game is NCSoft and the developer is ArenaNet. Factions sounds like it may have a few features to set it apart form the MMORPG pack.