Got Uverse installed on Saturday and just tonight realized that 5.1 is not being output via HDMI.  Just ordered a toslink cable in hopes to correct this GLARING issue by AT&T.  Luckily my receiver has the ability to receive audio over toslink and video over HDMI.  I haven't experienced any audio drop out yet, but I will admit that the picture is not as good as Comcast.  However, overall I do like it so far, but will like it better when I fix the audio issue.

I hope they fix this soon.