Documents appeared on the FCC web site today showing a version of the HTC Herald branded for T-Mobile USA. The Herald - officially called the P4350 by HTC - is a successor to the MDA currently offered by T-Mobile. Notable improvements include a thinner body, spring-assisted slide, and 2 megapixel camera. Although the European version launched with Windows Mobile 5, the user manual submitted to the FCC for the T-Mobile version clearly shows Windows Mobile 6. Like the MDA, the new model features a touchscreen with stylus, quad-band GSM with EDGE, Bluetooth, and Wi-Fi. The photos show two potential color schemes: one in blue/purple, and another in all black.