As this thread morphed into a general-patch discussion, will be putting original 0.3.1 OP under spoilers.
From: http://blog.worldofwarships.ru/0-3-1-byulleten-razrabotki/
IJN CVs, Hosho, Zuiho, Ryujo, Hiryu, Zuikaku, Taiho and Hakuryu.
AND
USN BBs, which will include Michigan, Arkansas, New York, New Mexico, Colorado, North Carolina, Iowa and Montana.
High-level cruisers. As an experiment Ibuki, Senjo, Baltimore and Des Moines get activated ability "Rehabilitation work", which was previously available only battleships.
Kitakami - wonderful, but extremely fragile ship - got their hands on the smoke machine. We hope that the opportunity to put a smokescreen to make this unusual gameplay more comfortable cruiser and diverse. And he's not the only representative of the Imperial Japanese Navy, which has evolved, we have increased rate of guns CC battleship Yamato, swapped Mogami and Myoko, Senjo points added combat capability and rate (by the way, it will now be called Zao). Against the background of all sorts of changes in the East, it should be noted little innovation in the West: the cruiser Baltimore will delight their commanders increased rate
rip Mogami 155 spam, 2014-2015.
Also, probably a result of google translate derping but "rehab work" is the repair skill on BBs that heal dmg done by "light damage" and "moderate damage" shells.