Senran Kagura Peach Beach Splash is a new game being developed for the PS4 and it involves water guns. The SK girls are completing in some ancient Shinobi water gun tournament. The costumes they'll be wearing, obviously, instead of getting torn, will get wet. That's all from the first article.
Apparently the news on the second link the next game in the SK main series, and apparently it'll the last entry in the series. I'm hoping that's a typo or something, but if you read further on the article, it says Takaki is planning making developing a new game from this title, which means making another action SK game.
That aside, it looks there will be a lot of other features in the game too, like some New Wave G characters finally joining the fray. It might also support PSVR.
I felt I should post this here since no one did, as I far as I know. Anyone who feels sharing more info, post here or anywhere, as long as we spread the word that a new Senran Kagura game is on the horizon, it's dandy.