(source: http://forum.worldoftanks.asia/index.php?/topic/60369-sentinel-tank/)
Dear Players.
We’re very excited to announce that the Australian Cruiser tank Mark 1 (AC1), also known as the “Sentinel”, will be added to World of Tanks release 10.1 and World of Tanks Blitz update 2.4 later in December.
This is the very first time an Australian tank will be introduced to the game and it is a homage to the strong support that our Australian community has shown us all these years.
Additionally, Wargaming has recently recovered an actual Australian Sentinel tank and is currently transporting the tank from Austin, Texas to Cairns.
This tank will be on display at the Cairns Museum so stay tuned for more updates on that exciting project.