I have asked the tfs.visualstudio.com team to add Python 2.7.3 to their build server image so I can investigate using that as a CI system for VS 2012.

I have also submitted a oss project application to http://codebetter.com/codebetter-ci/ in case that environment will work better.  I was unable to determine if they have Python 2.7.3 as part of their build environment.