I mean, if that's something you wanted...
You've got to hand it to Marvelous. It knows its audience. The studio's latest effort, Senran Kagura: Peach Beach Splash, is a dramatic departure from its current fare (but with even more busty ladies) and now we finally have some details as to how it will play thanks to Gematsu.
Along with shooting enemies with water guns (which range from pistols, to dual-wielded pistols, sniper rifles, and something called a "shower gun"), players can "finish off" the girls by soaking their boobs and butts with the "Kunekune Finish" mechanic. This'll cause the girls to take various poses and certainly be something you'll want to watch alone in your room at two in the morning. Players will also have access to brief hand-to-hand combat (but nothing as advanced as the base Senran Kagura games) as well as a customizable card system.
Replacing the ninja arts from previous titles, players can equip up to six cards which include various skill and weapon buffs, as well as summoning little companion buddies to help in battle. It seems the card system will be the deepest mechanic Peach Beach Splash will have to offer, but if that's not your thing at least they all have cute images to gawk at.
OH, speaking of gawking, Marvelous also (helpfully?) uploaded a portrait of each of the girls in the cast along with some profile data with things like bust sizes, hobbies, blood types, voice actresses, and personalities. All the things you'll need to know before selecting your waifu. You can read the full list over at Gematsu.
Senran Kagura: Peach Beach Splash releases for PlayStation 4 in Japan on March 16 with a Western release expected later.