Read more here: http://blogs.msdn.com/b/visualstudioalm/archive/2013/02/11/february-ctp-for-visual-studio-update-2.aspx

We’ve just shipped the next Community Technology Preview (CTP) for VS and TFS Update 2.  This release is still not a broad go-live release.  Learning from our last Update (Update 1 – VS 2012.1), we are enabling go-live earlier.  In this CTP, we have identified a small set of “early adopters” who we’ll hand hold through a go-live experience on this CTP.  The next CTP we ship will be a broad go-live release.

The blog post in the above link has a list of features that are new in this update.  Check it out.

Brian