Kit Kat for S4 AT&T?

I don't sorry but this is precisely why I purchased the S4 Google Play Edition.

My phone is definitely gonna be a Nexus.. Love the quick updates & the custom roms.

Samsung have said that the S3 & S4 will get 4.4, but not when. All manufacturers are the same: a flagship model appears with the latest firmware and a huge advertising push, but within 8 months they focus on the next flagship and the previous model's development slows down. I spent years patiently waiting for my X10 to get Froyo, my arc to get ICS and finally the One X to get 4.3. Hence the Nexus 5

Again, just get the Google Play Edition and you would have been on KitKat 4.4 right now like I am. Sammy S4

Rumor has it that it may be late January 2014.

The gap between Android 4.3 from Google and the AT&T variant on the S4 was four months. If that timeline holds true again, you're looking at the end of February. But considering a French carrier has already scheduled it for late January/early February it's foreseeable that it may come to the US around then also. AT&T are not the greatest at rapid updates, but they're certainly not the worst either. Remember with the Android 4.3 update recently they pulled the update pronto when there was a problem, then released the fixed update and the stability patch first too. So at the very least there's a good chance that AT&T will get KitKat right when they do release it.