It seems like only five days ago that the inaugural PAX East came to a close, and now pre-registration for PAX...West? Just PAX? What the hell do we call it now? Anyway, you can buy tickets now.
It looks like the official PAX website is referring to the Seattle branch of Penny Arcade's annual convention PAX Prime. I suppose that's okay, but it really isn't official until it carries the Matric of Leadership deep within its chest cavity, ready to light our darkest hours.
Speaking of darkest hours, PAX tends to sell out, no matter which side of the country it's being held on, so if you plan on hanging about the Seattle Convention Center from September 3 through September 5, you might want to lay down your $55 now. That $55 becomes $60 on September 3, but I wouldn't worry too much - tickets will be long gone by then.