AT&T is particularly noteworthy because the carrier is offering $100 off tablets purchased with a 2-year data contract through February 14th.
Apple added support for a number of new LTE carriers in the iOS 6.1 update that was released yesterday, and presumably all those carriers -- as well as normal iPad sales channels -- will carry the new 128GB iPad on launch day.
Article Link: Verizon, Sprint and AT&T Confirm They Will Carry 128GB iPad WiFi + Cellular