There seems to be one for EE in UK. You swap you 3G handset and get 70% off the remaining contract length or something.
That would be great over here but I highly doubt AT&T would go for it. The trade-in would be done at a retail location or more than likely a mail-in offer. That leaves someone footing the bill upfront and waiting for someone to (1) receive the phone and verify the condition, (2) relay that information back to AT&T and (3) have the carrier credit you the difference on the ETF to sign a new two-year.
Now, if this was Apple and it was the iPhone 5S being lauched 6 months after the iPhone 5 came out there would be a concession like this. However, Apple would easily take care of the fulfillment. Nokia, AT&T and Microsoft have a mutual interests however if Windows Phone dies it won't be the end for Microsoft or AT&T. Nokia can be purchased by another company, likely Microsoft, who can then continue with the intellectual property and integrate it into its own products for Windows and Xbox.
If WP8 is a success, it doesn't mean AT&T will continue to give it shelf space. It has to dominate at this point, which Windows 8 centric devices can manage to do. They need more than just an unidentified spot on an AT&T commerical and actual primetime appearances on network television and use by high profile people. Reveal to people that Windows, on a phone, is better than say Google's version of Linux.
I'm rambling here but have a commerical with three guys on a subway....
One has an iPad
One has Surface
One has a Nexus 7
Guy on the iPad is flicking pictures around and organizing his music collection. Updates Facebook about a reunion party the three of them are going to, going on about how to get there before stopping short of using Apple Maps.
Guy on the Nexus 7 sends a quick message via Gmail using the front facing camera on his device, then says that he's pulling up the directions on his Nexus now. He gets the results fairly quickly but is troubled to learn the presenter lost his slideshow and is struggling to find the photos....
Guy on the Surface goes "no problem". He opens up Skydrive and begins importing the pictures that were used in the presentation and starts putting together a slideshow in PowerPoint. He comments that he'll send it over to presenter's Lumia....
Cue the 920 user who then fires up the presentation....
"looks great. thanks."
Then the surface user fires up Angry Birds. The other two guys stare at him.
"Wait, you did that with Windows?"
It's time for people to be reintroduced to what can be done with Windows but is often regulated to other operating systems because it looks neater.