We've learned that Pantech and AT&T are apparently hard at work on the successor to the Duo C810 smartphone, a Windows Mobile 6 Standard device whose claim to fame is its dual slide mechanism in the same vein as the Pantech-sourced Helio Ocean. The Duo 2 -- model number C820, naturally -- is said to feature a rounded black case that recalls the look of Motorola's old MPx200 and clocks in with dimensions very close to those of the HTC Vox. We're also told that the dual slide feel is "excellent" with well-illuminated buttons on both the numeric and QWERTY pads; the QWERTY side is apparently the easier to use of the two, with the numeric side being just a bit difficult to navigate by feel alone. Up front, the 2.4-inch screen is QVGA (who'd have thought?). Along the four edges you'll find a Pantech proprietary charge / sync connector and a microSD slot protected by a hard plastic cover.
It doesn't sound a heck of a lot different than the phone it replaces so far, but here's where it gets a little interesting: the C820 moves up from a 1.3 to a 2 megapixel camera and packs Windows Mobile 6.1, which apparently is already pretty well customized for the carrier thanks to the inclusion of apps like MobiTV and AT&T Music. Follow the break for software, memory, and processor details; since we might be waiting a while for a release, you may as well get all the info you can in the meanwhile, eh?