AT&T has let slip its three Windows Phone 7 launch devices prior to impending announcement: the Samsung Focus, LG Quantum, and HTC Surround. So far only teaser info is give about the trio of handsets:

HTC Surround (formerly the T8788) – Slide-out Yamaha speakers, 16GB storage, Dolby stereo or surround sound

LG Quantum (not the Optimus 7) – QWERTY, five-megapixel camera

Samsung Focus – Four-inch Super AMOLED, 110 grams, “enhanced photo features”

(via: AT&T)