Of course it does. I'm trying to make the point that one shouldn't even have to dig that minuscule amount to find out. It's as simple as adding a line to their landing page: Wagtail supports Python 2.7 and Django 1.6.2.
Thanks for the comment ryannevius. Sometimes it's the obvious things that go overlooked when writing a stack of documentation! There's now a note about supported versions on the Github README and the Readthedocs landing page.
