Next WoT patch – 9.15.1

The next WoT patch will be 9.15.1 and is supposed to be a so-called “technical and intermediate” update, no release date is known yet. 9.16 is expected to come around August-September.
No full patchnotes were provided yet, only the following is known.
EDIT: Patch is now on Supertest. Added full list of changes.
Game Features:
– Sound improvements:
– Added sound for damage to own tank due to HE splash;
– Added sound informing about allied tank’s death;
– Implemented 3D positioning of enemy spotting sound;
Technical Tasks:
– Reworked visual effects of tanks sliding against one another;
– Various optimizations regarding performance stabilization;
Tanks:
– Following changes to Soviet tanks were made:
ISU-130:
– Dispersion while moving the hull reduced by 40%;
– Dispersion while turning the hull reduced by 40%;
– Maximum reverse speed changed vron 12km/h to 14km/h;
– Maximum speed changed from 34km/h to 38km/h;
– Viewrange changed from 350m to 380m;
– Aimtime of the gun 130mm S-26 changed from 2.5s to 2.1s;
– Reload time of the gun 130mm S-26 changed from 12s to 10.3s;
– Precision of the gun 130mm S-26 changed from 0.4 to 0.37;
– The tank Lorraine 40t was replaced by Bat-Chatillon 25t AP;
– Following tanks were added for supertesters:
– Object 257
– Strv m/42-57 Alt A.2
–  T95/Chieftain
–  VK 65.01 (H)
–  Rheinmetall Skorpion
–  Krupp-Steyr Waffenträger
The following 24 vehicles were remade into HD quality:
МТ-25
G.W. E 100
FV304
Jagdpanzer 38(t) Hetzer
Dicker Max
Pz.Kpfw. III
E 75
Waffentrager auf Pz. IV
АТ-1
AMX 13 75
SU-100Y
SU-100М1
T57 Heavy Tank
Großtraktor – Krupp
M37
113
G.W. Tiger (P)
121
M22 Locust
FV215b (183)
M8A1
T-34-1
Rhm.-Borsig Waffentrager
G.W. Panther
Additionally, following HD tanks were reworked:
Tortoise
M103
M18 Hellcat
Maus
Maps
– “Prokhorovka”, “Cliff”, “Ensk” and “El-Halluf” got their minimaps redrawn in the new style;
– Updated some effects on the following maps:
“Training ground”
“Karelia”
“Himmelsdorf”
“Prokhorovka”
“Ruinberg”
“Mines”
“Erlenberg”
“Sand river”
“El-Halluf”
“Airfield”
“Fiery Salient”