You can check the trailer out just past the break, and the game's beta servers are open now through May 18th. The team is also planning on hosting a livestream today on the official WildStar channel at 2:00 p.m. EDT, as well as another longer stream on Friday starting at 2:00 p.m. EDT. Or you can just jump in on the servers now if you want to see how the game plays out.
[Source: Carbine Studios press release]
[Update: Composer Jeff Kurtenacker just let the Twitterverse know that the open beta music is live now on SoundCloud!]