This trailer shows off gameplay from The Forest, a first-person, open-world survival/horror game in the works at SKS Games, a Vancouver studio formed by special effects artists who have worked on films like 300 and TRON Legacy. They say an alpha version of the game is expected this year, and the video, in which it can be difficult to see the forest for the trees, calls the footage it includes "pre-alpha." The game is seeking Steam Greenlight support, and here's why they feel it's worth your vote from The Forest website:

The world
Enter a living, breathing forest with changing weather patterns, plants that grow and die. Tides that roll in and out with the day/night cycle. Below ground explore a vast network of caves and underground lakes.

Complete player freedom
Chop down trees to build a camp, or start a fire to keep warm. Scavenge food to keep yourself from starving. Find and plant seeds to grow food.

Build a small shelter or a large ocean side fortress. decorate your home with found items. Lay traps and defenses to keep a safe perimeter.

Gameplay
Explore and build during the day. Defend your base at night. Craft weapons and tools.Bunker down during the evening or bring the fight directly to the enemy.

Fight or Hide
Use stealth to evade enemies, or engage them directly with crude weapons built from sticks and stones.

A new type of open world, survival horror experience
Defend yourself against a clan of genetic mutant enemies that have beliefs, families and morals and that appear almost human.