AT&T U-Verse hasn't officially announced they have a carriage agreement with Pac-12 networks. As of today PAC-12 networks is showing up on my U-Verse online program guide and Titan TV's program guide.
the uverse and titan tv screenshots were taken @ 6:12PM PST
Pac-12 networks will be on HD on 1759, 1760, and 1761
SD channels will be on 759, 760, 761.