There has been announced that there will be a third beta weekend, though the date has not been set yet.
Some articles are expressing frustration at no date for release yet. The articles I've read have compared GW2 betas to RIFT, SWTOR, TERA, and TWS betas. Basically saying that these games all had a release date, 2-3 betas right before release (weeks to a month), then the actual release. GW2 has had 2 betas more than a month apart with a third beta announced and still no release date.
One article said, 'if the Asura and Sylvari are ready to be tested, we could be looking at a release date close to August-September. if the Asura and Sylvari are not ready to be tested in the third beta, and more problems crop up, then we could be looking at a release date close to the holidays.' Either way, GW2 fans are starting to get frustrated with not being able to play the game they've paid for months ago.