On May 28, 2009 Google announced Google Wave to the world.
On Wednesday, September 30 Google sent out more than 100,000 invitations to preview Google Wave to:
- Developers who have been active in the developer preview we started back in June
- The first users who signed up and offered to give feedback on wave.google.com
- Select business and university customers of Google Apps
Since every invite was able to invite 8 more people we can safely assume that Google allowed for 1 million users in the first week.
Present amount of users: 100.000+
Estimated time to go live: First half of 2010.
Spoiler: I don’t have a Google Wave account and thus can’t invite anybody.