as you are curious about the "World of Tanks 10.0 Teaser", this is what EU didn't mention on their portal:
There will be a new "Deathmatch" ("Fight to the last") mode - it will use two maps: Paris and Berlin. In this mode there will be respawns, repair points, flag captures, air raid and artillery strike consumables.
The T-22 Sr. medium tank will be a prize for the best participants as well unique reserves.
Emblems will now give the crew unique bonuses, there will also be a PvE tutorial.