It would be a brilliant move on AT&T's part to offer 3G access to the new ipod touch. They are about to lose exclusivity on the iphone, and will likely lose a lot of customers soon. I don't want to change wireless carriers, and pay $2,000 for iphone service with ATT. However, I would sign up with ATT for a $15/month touch pay as you go data plan.
To all who think iphones and touches "cannibalize" each other, the new iphone4 has already come out, allowing Apple and ATT to make their sales and get the contracts locked in. So by offering the ipod touch now there is little to "cannibalize" (not that I buy that argument). If you want to pay twice the cost or more for one device, go for it, but you can have the same functionality for a fraction of the cost if they would just offer 3G touch. I will buy the new touch regardless, as long as it has camera, retina and hopefully GPS, but it would be awesome to have data too.