CAUTION FOR THOSE WITH LOCKED DEVICES: Considering you just got a new root method, I would steer clear from this if you want to keep root. I have a feeling Towelroot will not work after this since it only works for kernels dated before June 3, 2014. Also, this might break the current tethering hack as well for 4.4.2.
It would be nice if this were a 4.4.3 update, but I don't know at this time. Since I'm unlocked, I'm going to go ahead and sign up for it and see what happens.
Just wanted to get the word out to anyone with locked bootloaders to probably stay away from this unless you don't care about root and the tethering hack.
The bad news about this means the "can I unroot my KitKat phone" won't go away once the OTA comes out.