Ubuntu 7.04 Herd 2 has been released:

"Welcome to Feisty Fawn Herd 2, which will in time become Ubuntu 7.04.

Pre-releases of Feisty are *not* encouraged for anyone needing a stable system, or anyone who is not comfortable running into occasional, even frequent breakage. They are however recommended for Ubuntu developers and those who want to help in testing, reporting, and fixing bugs. Installing a milestone and then upgrading through the release cycle should leave you with a close approximation of the final release."

LinuxCompatible