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Damn, slow download. You can normally get in quick and download it before the masses overload the servers but not this time!
 
Check for Update button in iTunes 11.1 is still giving me the "6.1.3 is the current version" story. Guess I'll have to wait another few seconds and click it again! :p
 
It became available just a few minutes before 10:00 a.m. here in California. Initially it showed "about 18 minutes remaining" but it's down to 9 minutes now.
 
Downloading now :)!

Cant tell if my "7 hours remaining" are due to slow work wifi, Apple servers, or a combination. Hoping it picks up!
 
How big is the file size from iOS 6 on an iPhone 5?

From Ars Technica:
DEVICE - - - - - - - - - - - (IOS 6) - (IOS 7)
16GB iPhone 4 (AT&T) - - 13.3GB - 13.2GB
32GB iPhone 4S (AT&T) -- 27.8GB - 27.5GB
32GB iPhone 5 (VZW) -- - 27.5GB - 27.3GB
32GB iPod touch 5 - - - -- 27.8GB - 27.3GB
16GB iPad mini (Wi-Fi) -- 13.4GB - 13.1GB
32GB iPad 4 (Wi-Fi) -- - - 27.4GB - 26.7GB
 
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