One major missing element from the original Senran Kagura was 3D support. For one of its first 3DS titles, Marvelous left out the stereoscopic 3D for most areas of the game, most notably the primary action gameplay.
Senran Kagura Burst, a sequel that was announced today in Famitsu, fixes the issue, somewhat. Marvelous AQL has added additional 3D support to the game, but not for the action part. You'll now be able to view the locker room, where you dress your busty female ninjas up, in 3D. This was apparently a major request from players of the original.
For a look at what was 3D and what was 2D in the original Senran Kagura, see this story.
Burst makes one other major change from the original Senran Kagura. Instead of Asuka, Ikaruga, Katsuragi, Yagyu and Hibari, the playable cast of the original, the sequel gives you control of their rivals. The rival girls will be joined by their teacher Suzune, who with her 97cm bust size and low cut dress helps to explain the origins of the Burst name.
You can see how the rivals "stack up" in this image that Dengeki Online shared last year.
Senran Kagura Burst is currently 81% complete and will be released on August 30, priced ¥5,980. As a bonus item, Marvelous AQL will include in a visual book, drama CD and soundtrack CD. The cover girl of the book will be selected by fan voting at the game's official site.
Famitsu also briefly mentions that plans are currently in place for a Senran Kagura anime conversion.