I have a couple links on the forums about several different providers and 4G. They are different depending on the provider but most likely, AT&T wont be the first.
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2.5Ghz Custom PC (XP) + 2.0GHz Aluminum Macbook
Hell ATT wont give me 3G yet. So im sure I will see 4G around 2015.
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2 8GB's & 16 GB IPhone 3g's all jailbroken 2.2
The 8GB's are for sale. Matte Black Incase Slider
New Aluminum Macbook 2.4 Ghz, 4GB ram (back to 2GB thanks to crap MacBook firmware), 250 HD
About a year ago I heard AT&T was going to work on plans for 4G... haven't heard anything since. That is a good question, though. The wireless world moves way too fast! 5 years ago people were excited about switching from TDMA to GSM phones... now there's talk of 4G? good grief...
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iPhone 3G 8 gig - and I can't upgrade to the 3G S until I am eligible in 2011