Any informed guesses on when the Nexus 7 and 4 will get KitKat?

I know if I really want KitKat I should just break down and buy a 5, but I just bought a 7, have a 4. I also know KitKat isn't going to be life-changing.

Still, I get antsy when I know there's something newer, and shinier and I don't have it.

It seems like I've always gotten updates within a week of announcement in the past.

Still kind of irritated that my wife's Gnex won't be getting updated, but luckily she won't be the wiser . . .