The first (and hopefully only) release candidate for IronPython 2.7.3 is now available. There are two major changes since the beta: first, the incompatibility with IronRuby 1.1.3 has been fixed, and second, assemblies for Windows Phone 7 are no longer included. The WP7 assemblies were removed because they are basically useless in their current state, and WP7 has a dwindling useful life. If someone wants to commit to maintaining them, send a message to the mailing list or @ironpython.
If there are no issues with the release candidate, 2.7.3 will be released on July 4.