Three weeks ago I announced that there will, in fact, be a fourth update to VS/TFS 2012. It’s going to be a very small update – really not much more than key bug fixes. It’s going to ship sometime toward the end of the year and, between now and then, we will be releasing as series of “Release Candidates”. Normally we’d only have 1 or 2 release candidates for a release but, in this case, we are going to have several.
Today, we released the second release candidate. You can download it here. And you can learn more about it, including what bug fixes it includes, in the KB article. I don’t expect a lot of people to install this build. If you see a fix in the KB article that you really want, feel free to install it – we feel pretty good about the quality. However, it’s certainly a work in progress and every few weeks we’ll be bringing in another set of fixes. I don’t expect you to update every few weeks and that’s why I’m being a bit muted in my enthusiasm. I’ll be imploring you to install an RC as we get a little closer to that last one 
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Brian