The AT&T Lumia 830 Windows Phone does, in fact, has support for Qi wireless charging. Many collectively crossed their fingers when Windows Central first reported that AT&T would leave the Qi wireless feature in place. There was some concern that a last minute decision would be made, and AT&T would remove this feature as they did with the Lumia 1020 and 925.
I've had my new Lumia 830 on the Nokia DT-900 wireless charging plate since bringing it home, and I am happy to share that the 830 works just fine with the Qi charger. The AT&T Lumia 830 comes with two battery covers (black and green) that are both compatible with the Qi system.
The 830 does become slightly warm while wirelessly charging and the re-charge rate seems to be slightly slower than what I've experienced with the Lumia 925 and Lumia 1020 (using the wireless charging case). Neither appears to be critical issues but noticeable differences.
Oh and for those who may be curious, the Lumia 830 fits nicely in the Nokia CR-200 Car Cradle.