Ok... Much earlyer than expected. GW:EN will be $39.99 (€34.99 or about 20 quid) and "will be released to the public on August 31, 2007."
Arenanet put out a press release today, as you can gather and it seems that October isn't soon enough. It's about 1 1/2 months before we thought the game would be out.
Most of it's marketing hype, and the big stuff I have said, but check out : This site to see for yourself