Guild Wars 2 lies in a strange place between being something of a man of mystery and having been on show for so long that our eyes have crawled across most every element of it. A lot of the promises being made are conceptual or may rely on idealised circumstances, but nonethless people are being won after dramatically: most recently, it won game of the show at the Eurogamer Expo. So when do we all get to try it? Well, a closed beta has been promised before the end of the year, with an open beta to follow and then a release date dependent on the success of that.
For now, perhaps the best you're going to get is TotalBiscuit's substantial videoing (a good 40 minutes, all told) of his high-level play sessions at the Expo - it shows off some the more ambitious mechanics as well as plenty of day-to-day beast-slaying. He seems very impressed indeed, for the most part.
Here's some adventures as a high Level Sylvari Necromancer:
And here's a spot of PvP manbashing, from the point of view of a Norn thief:
I met Mr Biscuit at the RPS post-Expo drinks, and I can attest to the fact he speaks exactly like that in person too.