A Treyarch developer has announced on the Call of Duty forums that the studio is hard at work on their next DLC for the Wii U version of Call of Duty: Black Ops 2.
I posted today that we are working on the next patch, which should include any updates/fixes made to the other platforms up to this point.
This was posted by a Treyarch developer who goes by A_Trey_U on the Call of Duty Community forums. This statement was in response to a question concerning any new downloadable content coming for the Wii U version of Black Ops 2. The developer did not acknowledge any new DLC plans and instead focuses on a new patch.
No news as to what specific problems this patch could fix as of yet, Treyarch should release details on it as we get closer to the patch date.