We ended up deciding not to do the same kind of compatibility update for VS 2005. We released compatibility updates for VS 2010 and VS 2008 (and, of course VS 2012 works). Versions before VS 2005 have always been supported via a MSSCCI provider for version control integration and side-by-side Team Explorer for other capabilities. We've decided to take that approach for VS 2005 now as well. So we updated the MSSCCI provider to support TFS 2012 and added support to make it work with VS 2005. Other capabilities can be accessed in a side by side fashion with a newer Team Explorer (which is a free download).
Brian