Team NINJA released their Version 1.21 update on the 10th of March and it is scheduled to release in two different parts. Version 1.21 will roll out with Tamaki's debut to Dead or Alive 6, the Design Contest Winner Outfit DLC & bug fixes. Version 1.21a is expected to release sometime after the original patch to address the hair rental service debacle that has now gone on for almost two weeks. Team NINJA has since apologized for the perpetual loop of hair color micro-transactions and hopes Tamaki will be the remedy players are looking for while they scout a fair fix.
Typically what gets people excited about these updates are gameplay changes, and outside of Tamaki's debut there are not any planned for 1.21. There are however new ranks available to you after 1.21 downloads which is something a lot of grind-heavy players have been asking about now for weeks. Along with that there are new purchasable DLC packs: Costume Contest Winners from Dead or Alive Festival and the debut pack for Tamaki.
Tamaki is a heavy alcoholic that utilizes the Aikido fighting style which is completely new to Dead or Alive and has been a fan requested style for many years. She doesn't appear to have the largest move pool, but Tamaki's defensive nature combined with her 10 frame jab, insane OHs and twisty throws should excite anyone that has been waiting for Aikido to finally come to DOA. Emery Reigns has described her as a cross between: Kokoro & Momiji.
As always please report any stealth changes you may find in depth at the system or character boards. This story will gradually change at Free Step Dodge as Tamaki is released with the 1.21 update.