This isn't exactly new at this point, but it's the most exciting new hip hop I've heard since Die Antwoord. The beat is just nutty, Originally produced by Polow da Don for Rich Boy. But Earl Sweatshirt (from the Odd Future crew) is absolutely right - nobody did it justice before him:
I just love the flow, the menace, the weirdness that clearly comes from someplace deep - way more legitimately promising for the underground than Lil B. Sadly, Earl is apparently missing, somehow, for the moment, so, you know, free him.