Android 4.4 Kitkat for Nexus 7 (2013), When?

Google was keen to ship Nexus 5 with KitKat 4.4 mobile OS preinstalled. But what about the other Nexus devices such as Nexus 7, 10, 4 and the beloved Galaxy Nexus?

They said it will be out in 'few weeks' but when? They should have rolled out KitKat update to other devices on Nexus 5 launch.

I feel like I have made a big mistake purchasing Nexus 7 yesterday..