The official release of GCC 4.2.2 has happened, and following on its heels is TDM's usual unofficial GCC build for MinGW. Binary packages are available as drop-in replacements for the MinGW project's official gcc packages.
As always, I've tested to ensure that it successfully builds wxWidgets (2.8.4) and Code::Blocks SVN.
Full details at
http://www.tdragon.net/recentgcc/ .
Note that you should only use this build if you need the features or bugfixes done since GCC 4.2.1. If you don't need them or aren't sure, you should instead use the official MinGW GCC 4.2.1 Technology Preview, or (most preferably) the official MinGW GCC 3.4.5 stable release.
Cheers,
John E. / TDM