Little Hints about the gameplay in the trailer:
1.The characters were separated at the start of the trailer. It could be you don’t play with both of them on the screen all the time. Or the gameplay alternates between characters.
2. Ellie takes cover at the door. It may not seem very original at first glance, but think about how many survival/horror games use stealth elements where you can evade enemies without being noticed, engage them in combat in different ways or go for the weak spot. In the trailer they team up to defeat the creature, this could very well be part of the gameplay. Set the enemies up, create diversions, trap them, or just evade them. It would be a nice shift from many so-called survival games where the options are limited and play very similar to other action games where you *must* clear the area to be able to advance.
3. Melee combat is obviously a big part of the game.
4. You may be able to search bodies for items/clues.
5. Bullets will be scarce. Don’t expect this game to be a shooting gallery like Resident Evil/Dead Space with all sorts of cool guns to upgrade, or like Uncharted for that matter.
6. Some enemies are really fast and aggressive (the mutated kind at least), they are gonna demand a good use of strategy and stealth.
7. You may be able to run for it in some scenarios? like I said on point #2 if stealth is actually involved, you won’t be forced to kill everyone or anyone. It’s survival after all. It would be cool if a zero-kill playthrough is possible, much like MGS.
8. This is just a guess, but I think the fungus is using nature to spread all over the Earth. So it’s not only infecting animals but all vegetation as well.