As someone said, the Guild Wars 2 closed beta will be out before the year is over. Beyond that, Arena Net HAS released a timeline: closed beta --> open beta --> full release. Each of these determines the release of the next phase. So, if the bug squashing process goes particularly smooth, we could see a sooner release.
Most of this info I'm getting from their twitter. Still no release date, but it's resonable to presume it to come in the first half of 2012. For those REALLY hyped, there are the closed beta (presuming this phase has select public participation) and open beta (for the entire public).