Back on October 26th, we reported Yahoo! To Add No Yahoo Directory Tag. Since then, it has been very quiet on the Yahoo! front for this topic.
Finally, Tim Mayer of Yahoo! replied to the questions as to when it will happen.
He said in a WebmasterWorld thread, in post number 3189985:
We are planning to do this in the near future. It is in progress. I will check if this will go into the next update happening in January.
So, the last Yahoo! update was on December 11th, so hopefully early to mid-January we will see this new feature.
Forum discussion at WebmasterWorld.