So, I've watched the videos in archive post and here's what I've noted.
1. You can choose to bleed out when dead, which probably means there's gonna be an option to revive a fallen teammate. (Medic class, or just everyone has a needle)
2. You can carry a lot of weapons.
3. You have stamina for rushing (like Diablo 2)
4. There's some crates where you can resupply.
5. "Action ring", A bit like snake, you can see where there's gun fire. If it's red, that means your getting shot, but if it's white, it seems to tel you where the action is.
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There's certainly more, but that's the main little things, I've spotted so far.

