Each of these, released via Game-Jouhou, show off numerous new aspects of the next Senran Kagura release that's set to hit the 3DS on August 7th in Japan.
Pair Battle/Tag-Team mode(AI will roam freely or can be ordered)
Tag-team Special move
Weapon Switching & Customisation with 'gems'
Pair-battle Introduction (when choosing a certain pair)
Improved costume damage (enemies also exhibit clothing damage)
Source [Siliconera] [Game-Jouhou]