What I don't get is why the Wii U doesn't support Dolby (or DTS), the Wii did.
I have all kinds of sound issues on my Wii U when I try to use surround sound, certain characters in a game will not speak their dialogue. My surround system is a pretty old 5.1 and does not support HDMI, so I hook the HDMI to my television and run an Optical Audio cable from my TV to sound system. Works fine on my Wii, PS3, Xbox 360, and PS2 but the Wii U has problems. I contacted Nintendo and they told me surround was LPCM format and then I contacted my TV manufacturer (Vizio) and I don't think they really new anything about what I was talking about but told me my set up should work fine for LPCM.
So anyway I am stuck using my Wii U in stereo mode.