Looks like RC (or whatever) bits are available with a product update:
The problem? Clicking the Update button takes you to a url that doesn’t work outside of Microsoft’s internal network 🙂 Oops!
[EDIT] forgot to point out that I already have 11.0.50323 installed (the .1 build, even later than .0), so I’m guessing this is part of an initial hiccup in trying to push out a newer change. Either that or some broken version checking logic that happened to kick in today. 🙂