Quoting Jesse Vincent on p5p:

There won't be a formal release announcement of this one, as it's even          
more "just a snapshot" than any recent blead release.

ec32898f89531e187f7daf7f9f28c15686845996  perl-5.12.0-RC0.tar.gz

More than anything else, this release is just to get everyone smoking
something calling itself 5.12.0.  Not surprisingly, that's already
turned up a few issues in early smokes.       

To be able to ship a 5.12.0-RC1, we need to understand why any smoke
servers are failing and either fix the bugs in a minimially-invasive
way or TODO the tests (if apropriate).        

Right now, the smoke reports are awfully black looking:

    http://www.nntp.perl.org/group/perl.daily-build.reports/           

One item that catches my eye is that most of the win32 smokes seem to
be failing the same test in io_sock.t         

This is the time for the Perl community to do something. Test your code now. Waiting for the release of 5.12 to test your code means waiting a long time before any bugs will be fixed. Build perl, test your code, report the status.