The ThinkPad will support GSM 850/1900, CDMA 850/1900, and WCDMA II, IV, V bands. This will cover AT&T, T-Mobile, Verizon, and many smaller networks. Unfortunately, it will not support any form of 4G technology according to the FCC. Considering the amount of competition in the current tablet market, 4G is a major player.
Lenovo’s ThinkPad has been out for a good while, but as a WiFi only device. Adding 3G compatibility to practically all US carriers will help it reach a wider audience of consumers. Expect no changes in hardware or software for the new version, as it will be essentially identical; you’ll see the same NVIDIA Tegra 2 processor and 1GB of RAM.