so, we have an update about xcode situation, from the official mailing-list:

[Chris Espinosa]: Xcode 2.4, an update to the Xcode 2 IDE, is announced today and available on connect.apple.com (Access will vary by developer type and geography today as we push the content around the world). This is a public release and it can be discussed freely on xcode-users.

Xcode 3.0 was announced today as the development environment for Leopard, for shipment with Leopard in Spring 2007. The existence of Xcode 3.0 is public and announced, but its features, content, and details are under nondisclosure to seeded ADC members.