Mass Effect 3's Omega DLC will not be available for Wii U, according to the official Mass Effect Twitter.
Via a conversation with another Twitter user, when asked if the Omega DLC would be released on Wii U November 27 alongside the other versions, the reply was: "Unfortunately it will not be available for Wii U."
When asked if any other DLC for the game would be released for Wii U besides what is included on the disc, the rely was "never say never."
The account also said there wasn't anything to "announce at this time," regarding the release of Mass Effect 1 and 2 for Wii U.
Mass Effect 3: Omega releases on PS3 in the US on November 27, and on PC and Xbox 360. The DLC will arrive on PSN in Europe the following day, November 28 via the usual PS Store update.