Ravi Shankar, my colleague in the test management team, published a list of features that we added in test case management tool in last 1 year or so. I find that list really useful, so sharing it with all of you here.
Here you go: -
VS 2012 (Microsoft Test Manager) - RTM:
VS 2012 Update 1:
VS 2012 Update 2:
VS 2013 Preview