According to a tip received by CrunchGear, the HTC Kaiser version offered by AT&T will be known as the Tilt. In fact, two versions could be available, one with a camera and one without. We already know that the FCC approved three HTC Kaiser variants so this is not an implausible scenario.
All three Kaiser variants will come with 400MHz Samsung processors, Windows Mobile 6 Professional, 128MB RAM and 256MB ROM, quad-band GSM/GPRS/EDGE and tri-band UMTS/HSDPA, a 2.8-inch QVGA screen that tilts when the keyboard is out (hence the name), a slide-out QWERTY keyboard, 802.11 b/g Wi-Fi, Bluetooth 2.0, integrated GPS, and a microSD slot.
The AT&T Tilt could be available as early as late August.
Update: CrunchGear is now reporting that the AT&T Tilt will be available September 3rd for US$499 with a two-year service plan.