The guys from Unwired View got some info about this device and it looks very interesting.
The HTC Omni should be available in October, it will use Windows Mobile 6 and will have lots of sweet features like a 4" display with 800 x 480 pixels resolution and a subdisplay, UMTS/HSDPA, TV and VGA out, WiFi support, GPS and a full QWERTY keyboard.
Full feature list:
Windows Mobile 6.0 OS UMTS/HSDPA connectivity WVGA 4″ 800×480 px display, subdisplay TV and VGA out 256 ROM, 1280 RAM and microSD memory card slot Wi-Fi b/g, USB and Bluetooth connectivity GPS/A-GPS Full QWERTY keyboard Dimensions: 130 x 81 x16 mm