Of the three Windows Phone 7 devices that were released to AT&T, the LG Quantum had the most hazy launch date. But that day has come, says an official press release from LG. The 1GHz device is the only Windows Phone 7 you can get with a side-sliding keyboard (though the Venue Pro comes close with the bottom-sliding keyboard). It comes with 16GB of onboard memory, 512MB of RAM, a 5MP camera with LED flash and 720p video recording, and DLNA support. The press release also mentions that LG WP7 device owners will get access to exclusive premium software. The Quantum will run you $199.99 straight from AT&T.
Source: LG Press Release