The underlying network technology to support the multi-player version of the game is almost done and stress tests are being carried out to ensure it can support large numbers of players. A single player version will also be available.
Multiplayer: you will be able to control who else you might encounter in your game – perhaps limit it to just your friends? Cooperate on adventures or chase your friends down to get that booty. The game will work in a seamless, lobby-less way, with the ability to rendezvous with friends as you choose. This technology is already working, using a combination of peer-to-peer (to reduce lag) and server connections.