Guild Wars 2 is the sequel to the Guild Wars series which is currently in development by ArenaNet. The game will feature a new game engine as well as changes to character development and the PvP system.
All released information regarding it has been compiled below. If you have a specific question in mind, please check the FAQ first.
There will be no monthly fee associated with Guild Wars 2, keeping up the tradition of the Guild Wars business model. Mike O'Brien has stated that expansions and/or mini-expansions are more likely than standalone campaigns, but a final decision has not been made yet. The game will be on multiple servers or "worlds," but players will not be bound to a world and may therefore change servers easily. The exact mechanic for this has not been announced. Guild Wars 2 Gold will be designed to run on computers with mid-range gaming specifications, but will have higher requirements than the original Guild Wars.
No release dates have been announced. Information released in the 4th Quarter 2009 NCSoft Report states that the "current development target for Guild Wars 2 is for the end of 2010 with the full commercial release taking place in 2011." Information gleaned from 3rd Quarter 2009 NCSoft Report specifically states that GW2 will likely have a public event in the form of a closed beta in 2010 with current projected release date in 2011. More information about the Guild Wars 2 beta testing and the game's release can be found at the FAQ page.
Demo participants were able to play as either a starter level human (about lvl 1) or a higher level charr (about lvl 40) and were able to play one of the four known professions; elementalist, warrior, ranger, or necromancer. The human area was a playable area around Divinity's Reach (what is now Shaemoor and the surrounding areas) in which players would fight a large earth elemental as the big boss battle. Guild Wars 2 Gold charr playable area was around what is now the from ruins of Surmia to Serenity Temple and the surrounding areas; the large boss battle was with the Shatterer, a dragon lieutenant. The demo had a time limit of 40 minutes.