You may know this vehicle (the FV4202 premium replacement, a video with it was posted by WG a while ago), but the actual appearance of the tank was not made known. I will post some pictures of it here, do not be afraid to click them since they are pretty high-res:
The mantlet is 240mm, with the ring being 200mm all around. The actual turret ring is 152mm, but it is a tiny target. Front hull is thin but well sloped. Rear is garbage(normal thing). Sides are OK, 90-100mm effective straight on.