I have discovered upcoming skins in BrokenBone's inventory, which are:
Korean tanks (South Korean but generically named Korean)
A Snow Map
A Circular 4v4 map
The new snow map named 'Snowmap' (must be a placeholder). It appears the patches on the ice are water, possibly containing oil. This is unlikely because a shipyard would be needed and that would virtually be right on top of the oil.
This has a lot of C4 on it (Soviet Explosive)
The Japanese oil ship actually has parts of oil rig on it, instead of just being a tanker.
A circular 4v4 map named '4v4Map4', probably actually going to be '4v4 Map 4'. What's interesting about this map is the game relies on having a good navy, and you need a navy to win, as it's the only way to reach the other side. you can't simply fly over the wall. there is also space for bases or maybe even crystals on the sides. This map is interesting and challenging. Also note how the ocean entrances are funnel shaped, not letting much units in at once.
Note how the Soviet heavy tank is a light amphibious tank IRL, a PT-76. The light tank strangely is a T-54/55, a medium tank.
Notice how the Vietnamese Anti Air tank has an M134 turret instead of something meant to bring down planes.
Also note how the Japanese gunboat has three turrets.