Its been rolling out, apparently, but my Nexus 7 was unloved as of 11am this morning.
Factory images are up, and manual update files are available though.
My Nexus 7 got the update today after I did the settings > apps > all > Google Services Framework > Force Stop > Clear Data a couple of times (3-4th try workded for me)....I'm impatient
For some reason the play store was acting up tho. Had to remove my google account and add it again to fix it.
I did it manually on my N4, my N7 is rooted and running custom stuff too so I'll update that when there's a rooted ROM out, I didn't see one last night.