Apple has sent out brief teaser emails to developers inviting them to WWDC 2007. The email reads:
See the future.
Then take it home with you.
The Leopard beta. Available first at WWDC.
At the Apple Worldwide Developers Conference, we're planning to show you a feature-complete version of Mac OS X Leopard, and you can take home a beta copy. Be the first to get your hands on the Leopard beta and get a huge head start on development. Register now for WWDC 2007 -- it's your ticket to the future of Mac OS X.