1.a. Tanks will be support for Infantry.
1.b. Anti-tank weapons will make much more of a difference, and be more prolific. So, even if you choose an Infantry-centric Battlegroup, you will have the supporting arms such as anti-tank rifles, grenades, guns, and launchers (Bazookas, Panzerschrecks, etc).
2.a. There is not much to tweak, unfortunately. If Relic supports tweaking of it, we will for sure!
2.b. For example, we would love to give turrets their own sight hardpoint, or give each man in a squad their own sight (currently it is only one or two max).
3. Absolutely! Contrivance will have more on that.
4. That is actually a good question. I am not sure what we have planned for blizzards, but rough terrain such as heavy snow and mud will actually cause vehicles to get stuck. Vaulting will probably remain untouched, since it is hard-coded.
5. It depends on how much we can change, but we already have our own custom UI in the works.
6. To the death, or to the rear (sending them back to your reserves). Repairing from 1% HP to 100% HP is not something we are going to do. It will most likely be battlefield repairs that either get your tank moving again, or put out a fire, or similar. But, a tank with a damaged or destroyed engine will continue to have it from that point on.
7. Organization and equipment of a nation's force are what will set them apart from other nations.
8. Yes, this is basically a total conversion. Very little of the vanilla game will remain.
Thanks for the questions! Contrivance will probably have more to say.