Source: Redditor Masauwu.
New tank “exterior” interface

Rampage mode personal missions

The blue Sherman with a big boomstick

Centurion Action X

Skoda T40

The new emblem and inscription bonuses
Sadly there is no flexibility in choosing which image to go with your wanted bonuses, so expect to have a lot of random nonsense on your tank. Usually the same as everyone else.