I've been using Git from command line with my visual studio projects already. Integration with TFS is a welcome change. Although I wonder how much effort Microsoft has to go through to change TFS's underlying SVN architecture to support Git. I will be the first one to try this and report.
TFS doesn't have an underlying SVN architecture - Team Foundation Version Control (the centralized version control tooling that was the the only version control services available through TFS 2012) is unrelated to SVN. There are no changes here to support git - git repositories are first-class citizens, hosted separately from the existing centralized version control services.
