The game's info page lists most of the usual action-RPG features, plus "nonlinear storytelling" with regards to quests, guild castle building and management, and siege warfare. We don't fully understand the nonlinear storytelling bit, although it's included in the press release as one of the major selling points of the game. It sounds cool up front though.
Sign-ups are already underway for a closed beta test, so if you want to give the game a try, that's probably your best bet.
[Via Ten Ton Hammer]