The following quote comes from the brownie-loving community communicator over on the Activision community forums, A_Trey_U:
January 21st, 2013 11:51AM
We are wrapping up work on our next patch and hope to be submitting to Nintendo in the next day or two.
To those questioning our ability to get these out quicker, please understand that there is a process to this. Fixes have to be implemented by various people in the studio (all teams, not just the Wii U team), brought over to the Wii U, then tested thoroughly before the update can go to Nintendo. At that point, Nintendo spends time testing it on their end before releasing the patch to you.
Once Nintendo supplies us with a date that we can expect the patch to go live, I will publish another update. Sometimes they give us a few days warning, sometimes they give us a few hours warning. I will do the best I can to get you the information you are asking for in a timely manner.
This was posted on January 21st, so they have probably already submitted it to Nintendo, and we'll likely hear an announcement about it within a week or two!
Via Activision Community