Shane Carruth's 'Upstream Color' is already one of our most anticipated films of 2013, and now we've got a second teaser just as beautiful and mysterious as the first.

Shane Carruth hasn't released a film since his first, 'Primer,' in 2004. But he's finally back with 'Upstream Color,' set to premiere at Sundance in January, followed by a theatrical release in April.

The first teaser was trippy, visually driven and vague, while offering no real dialogue, but this second teaser, courtesy of Badass Digest, gives us much more to go on. Still, like the first one, this teaser isn't interested in giving away the plot so easily. The official synopsis:

A man and woman are drawn together, entangled in the life cycle of an ageless organism. Identity becomes an illusion as they struggle to assemble the loose fragments of wrecked lives.

'Upstream Color' sounds sort of abstract, leaning heavily on subjective thinking. And yes, we are so sold on it.

You can check out the new teaser below, which features a lot of fuss over whether a flock of birds are starlings or grackles, but more importantly, this teaser continues to expand on the tone of the film, which feels a little dark and unsettling.