Who the hell is going to go ANVIL as brits now? There is not a single reason to go ANVIL with the ultra nerf to Churchill's armor. The HP nerf it's fine but nerfing it to 200 armor it's a joke.
It was supposed to be a defensive choice with a tank capable to actually tank some damage and bounce some shots, if you remove that from the Churchill you're left with a Heavy Tank that is not going to do the job.
Maybe I need to play the Balance preview to get a better understanding, but the Churchill still requires 9 hits from any source of 160 damage(most common and found on the majority of AT/tank cannons) and it can still deflect shells from PIVs. It also comes with Anvil engineers who can put it back together very quickly and while slow and vulnerable to explosives, can put up a fight when given LMGs ontop of their Vickers.
Maybe it's armour could go to around the 240-260, but we'll have to see. If it can still close in and chuck a grenade at a weapon crew/clear a position and escape and fend off things trying to get past it the Churchill will have its uses because those excellentrepairs will be around generally.
As for the things it should be front of/tanking for, well, that's another discussion with the Firefly being completely reliant on its gimmicky burst damage which I, in my opinion, needs to be altered. Still, you got those rather splendid 6pdrs to protect. Emplacements are still their own issue as well.