Cradlepoint has released new firmware for several of the newer AT&T modems. The Shockwave, Adrenaline, and Huawei 900 are all now supported by most of the Cradlepoint routers.
Conspicously absent from the updates are Cradlepoint's CTR350 and PHS300 which are both EOL (end of life).
Updates available at '»www.wirelessnwifi.com/Firmware-Updates
No word whether there will be any future updates on those discontinued products.