Well, it's a few minutes after midnight and AT&T's site is now live with their Windows Phone 7 offerings.
Both phones are of course $199.99, require at least a $15/month data plan and a 2 year contract. Don't forget about the AT&T Windows Phone entertainment pack, which includes the XBox Live puzzle-game "Ilomilo", a 30 Day Zune Pass, and a free month of AT&T U-Verse Mobile. The $29.95 valued freebie will be available to AT&T customers who purchase a Windows Phone between October 25, 2010 and December 31, 2010.
Thanks, Sean L, for the info!