There's a technical slap on the wrist for Yun and Yang.
Capcom has revealed a full list of changes for the new Version 2012 update for Super Street Fighter IV: Arcade Edition, which will be available on December 13.
Given that the log contains 12 pages' worth of changes, it would be mad to even begin to cover all the tweaks that have been made. That said, it seems that (relative) newcomers Yun and Yang have seen a lot of attention – mostly in the form of nerfs to their specials.
You can check out the full list of edits here.