Thanks to Vaexa

Disclaimer: these are datamined changes, which means they’re a. not the official notes and b. I could’ve misinterpreted something here.

Data changes

Additions

Japanese tier 6 premium destroyer Shinonome and relevant modules added
Lootbox rewards added
Some additional ranked rewards added (probably not for this season)

Changes

Ships

Royal Navy cruisers: further balance work
Atago: armour model changed slightly
Anshan: armour model changed slightly (armour in some places became slightly thinner)
Lo Yang: armour model changed slightly (armour in some places became slightly thinner)
Sims: armour model changed slightly (armour in some places became slightly thinner)
Atlanta: armour model changed slightly (bow armour buffed 16mm > 19mm)
Molotov: armour model changed slightly (net buff)
Indianapolis: armour model changed slightly (armour got slightly thicker in some places)
Bismarck: armour model changed slightly (net buff)
Saipan: armour model changed slightly (armour got slightly thicker in some places)
Blyskawica: armour model changed slightly (armour got slightly thinner in some places)
Arizona: armour model changed slightly
New Orleans: armour model reworked, section HP redistributed
Mogami: torpedo ”dead zone” decreased, 203mm turret arcs buffed (see below)

Mogami turret changes

Turret #1: arcs buffed (145 > 150 degrees to either side)
Turret #2: arcs buffed (130 > 149 degrees to either side), pitch dead zone decreased (20 > 13 degrees)
Turret #3: arcs buffed (130 > 150 degrees to either side)
Turret #4: arcs buffed (140 > 150 degrees to either side)
Turret #5: arcs buffed (135 > 150 degrees to either side)

Shells

Costs per shell fired.

152mm AP Mark 35: cost decreased (15 > 10)
152mm HE HC Mark 34: cost decreased (15 > 10)

Torpedoes

Costs per torpedo expended.

Mark 16 mod. 1: cost increased (300 > 700)
Type F3: cost increased (350 > 650)
Mark 17: cost increased (500 > 1200)

Aircraft

Costs per plane lost in battle.

Grumman F3F: cost increased (200 > 220)
Aichi B7A: cost increased (600 > 1200)
F2A: cost increased (200 > 320)
B5N2: cost increased (300 > 550)
Vought SBU: module tier decreased (4 > 3), cost increased (200 > 320)
D4Y: cost increased (600 > 1200)
Grumman F6F: cost increased (350 > 550)
J7W1-A: cost increased (600 > 1200)
B6N: cost increased (450 > 800)
XSB2D: cost increased (800 > 1700)
XBTK: cost increased (800 > 1700)
TBD: cost increased (300 > 320)
SBD2: cost decreased (250 > 220)
D1A2: cost decreased (250 > 220)
B4Y: cost increased (200 > 220)
T4M ”float”: cost increased (200 > 220)
N1K5-A: cost increased (450 > 800)
F4U-1A: cost increased (450 > 800)
SB2U: cost increased (350 > 550)
TBF: cost increased (350 > 550)
D3A2: cost increased (350 > 550)
A4N: cost increased (150 > 220)
AD1: cost increased (600 > 1200)
F4F: cost increased (200 > 220)
D3A1: cost increased (300 > 320)
F4F-4: cost decreased (250 > 220)
TBY-1: cost increased (350 > 550)
FM-2: cost decreased (250 > 220)
SBD3: cost increased (300 > 320)
A5M4: cost decreased (250 > 150)
T4M: cost increased (200 > 220)
C6N5-1b: cost increased (800 > 1700)
J8N1: cost increased (800 > 1700)
A7M2: cost increased (600 > 800)
A6M5: cost increased (350 > 550)
R2Y1: cost increased (800 > 1700)
J5N: cost increased (800 > 1700)
A5M2: cost increased (200 > 320)
Wakusei: cost increased (800 > 1700)
XSB2D: cost increased (800 > 1700)
F2H: cost increased (800 > 1700)
SB2C: cost increased (450 > 800)
A6M2: cost increased (300 > 320)
D4Y2: cost increased (450 > 800)
F4U: cost increased (600 > 1200)
SBD5: cost increased (350 > 550)

Or, in a handy table form:

Plane	Tier	Carrier	0.5.12 Cost	0.5.13 PTS Cost
Grumman F3F	IV	Langley	200	220
Aichi B7A	IX	Taihou, Hakuyruu	600	1200
F2A	???	???	200	320
Nakajima B5N2	VI	Zuihou, Ryuujou, Hiryuu	300	550
Vought SBU	III	Langley	200	320
Yokosuka D4Y	VIII	Shoukaku, Taihou	600	1200
Grumman F6F	VI	Independence, Ranger	350	550
Kyushu J7W1-A	???	???	600	1200
Nakajima B6N	VIII	Shoukaku, Taihou	450	800
Douglas XSB2D	X	Midway	800	1700
Kaiser XBTK	X	Midway	800	1700
Douglas TBD	V	Bogue, Independence	300	320
Douglas SBD-2	V	Bogue	250	220
Aichi D1A2	V	Zuihou, Ryuujou	250	220
Yokosuka B4Y	IV	Hoshou, Zuihou	200	220
T4M “Float”	???	???	200	220
N1K5-A	VIII	Shoukaku, Taihou	450	800
Vought F4U-1A	VIII	Lexington, Essex	450	800
Vought SB2U	???	???	350	550
Grumman TBF	VII	Ranger, Lexington	350	550
Aichi D3A2	VII	Hiryuu, Shoukaku	350	550
Nakajima A4N	III	Hoshou	150	220
Douglas AD-1	IX	Saipan	600	1200
Grumman F4F-3	IV	Bogue	200	220
Aichi D3A1	VI	Ryuujou, Hiryuu	300	320
Grumman F4F-4	V	Bogue, Independence	250	220
Consolidated TBY-1	???	???	350	550
GM FM-2	V	Bogue	250	220
Douglas SBD-3	VI	Independence	300	320
Mitsubhishi A5M4	IV	Hoshou, Zuihou	250	150
T4M	???	???	200	220
Nakajima C6N1-B	X	Hakuyruu	800	1700
Nakajima J8N1 (Kikka)	??? (X)	???	800	1700
Mitsubishi A7M2	???	???	600	800
Mitsubishi A6M5c	VII	Hiryuu, Shoukaku	350	550
Yokosuka R2Y1	???	???	800	1700
Nakajima J5N	???	???	800	1700
Mitsubishi A5M2	???	???	200	320
Wakusei	X	Hakuyruu	800	1700
Douglas XSB2D	X	Midway	800	1700
McDonnell F2H	??? (X)	???	800	1700
Curtiss SB2C	VIII	Lexington, Essex	450	800
Mitsubishi A6M2	VI	Ryuujou. Hiryuu	300	320
Vought F4U-4	IX	Saipan, Essex	600	1200
Douglas SBD-5	VII	Ranger, Lexington	350	550

Miscellaneous changes

Black Swan: camera angles changed slightly

Localisation changes

Strings added for lootboxes and related achievements
Strings added for damage to forts statistic
Strings added for PvE-related things
Strings added for ”block division invitations” function
Strings added for Shinonome; descriptions, module names, etc
Rephrasing V: Rephrasibution

/u/godzilla5549 put together the table for the plane cost changes.
No details on the RN cruiser changes because they’re in playtesting and I don’t elaborate upon things in playtesting. Did that once with Indianapolis, never doing it again.

HUGE DISCLAIMER: This is all from the PTS. As we saw on the 0.5.12 PTS, things that are on the public test server don’t always make it to live. These are all subject to change.