libmesh-0.7.0-rc1 is available in .tar.bz2 (and soon in .tar.gz) files
on the SourceForge file download site (as well as a tag in the SVN
A full changelog will be forthcoming along with the final release.
0.6.4 users are encouraged to try 0.7.0 with their application codes
to test for compatibility. A few backwards-incompatible API changes
exist in header files, as well as header file restructuring and
forward declaration usage; most application code should be easy to
make compatible by explicitly including headers that had previously
been implicitly indirectly included.