Google has just announced that they’ll be opening up Wave to some Google Apps users this fall, and all of them by next year. Their statement:
Today we’re pleased to announce that we’ll be opening up access to Google Wave for some schools and businesses as part of the preview this fall. And while we won’t be able to open it up to all Google Apps users just yet, we hope to bring Google Wave to all Google Apps users next year. If you’re a Google Apps administrator and you’re interested in testing Google Wave, you can sign up here.
I would assume that this is some of the 100,000 users that they have said will be getting access on September 30, though they didn’t specifically address that date with this update. We’ll find out soon enough, I guess.