We have released a milestone build of 3.0 M1 here

The purpose of this release is for people to get their hands on a early version of hot deployment functionality. For details, please check out Andrew's blog post: http://blog.mulesource.org/2009/06/the-old-new-mule-3x-and-its-hot/

Hot deployment currently does not work with the stdio transport: see MULE-4381

Enjoy!