KentuckyHouse
macrumors 68030
Early upgrade is usually around the 1 year mark... It is $449 US. So, if your two year contract expires in May 2013 like mine, $449 will be offered October 8, 2012.
This is odd that you're not eligible for the early upgrade pricing until October 8th. I got my 4S on launch day and AT&T is telling me that I'm eligible right now for the early upgrade pricing. My contract also ends in May 2013.
I'm not planning on upgrading early, but I just thought I'd throw this info out there.