It looks like Pantech and AT&T are working on the successor to the Duo C810 smartphone.
The new Duo 2 C820 model is said to feature a rounded black case, similar to Motorola MPx200 and the same dual sliding mechanism as its predecessor with both numeric and QWERTY keypads.
Other features will include Windows Mobile 6.1 platform (apparently with preloaded MobiTV and AT&T Music apps), a 2.4" QVGA screen, a camera upgraded from 1.3 to a 2 megapixels, and a microSD slot. Overall, the new C820 doesn't differ much from the older model.
Stay tuned for more details...