Board Thread:Game Updates/@comment-3502824-20170330044846/@comment-26574811-20170422031900

Shinhwalee wrote: Taiyo-class Escort Carrier confirmed for release in Spring 2017 Event A single small Aircraft Carrier converted from originally a line of Three Sisters of Cargo passenger ship will be released in the Spring 2017 Event.

Although she is not powerful in her first form as an Aircraft Carrier, by receiving her next remodel, she will become a valuable asset in Anti-Submarine Warfare.

現在「艦これ」運営鎮守府では、春イベント2017【期間限定海域】の実装準備を両舷強速で進めています. 春イベでは、貨客船三姉妹を改装した小さめの空母の一隻を実装予定です. 最初の特設航空母艦の状態では非力ですが、大切に育て、改装を重ねることで対潜戦で強力な存在に成長します.

https://twitter.com/KanColle_STAFF/status/855601734047088642 Tiny correction:

Although she is not powerful in her first form as a "Converted Carrier", if you train her properly and give her some remodel(s), she will become a valuable asset in ASW.

Now, Among the three sisters of ocean liners, Chyu'yo was never labeled as "converted carrier" (特設空母), so she's out of the game, only Taiyo and Un'yo is left.

So now we can say that the new ship will be either Taiyo or Un'yo.