Honestly, it's hard to know what to make of Seven Psychopaths. Going by the trailer, the movie feels a little out of time, something I would have expected to come out in the late '90s, when the Tarantino effect was still being felt. The promised wit and quirk and panache and ensemble cast stands out in our current mainstream dichotomy of earnest violence and Superhero CGI.
Seven Psychopaths is about slick mugs who abduct the toy dogs of the rich for the reward money, and the oddball mayhem that ensues when they nab a Shih Tzu belonging to a particularly violent gangster. The roster includes Colin Ferrel, Sam Rockwell, Woody Harrelson, Christopher Walken, and Tom Waits. From the reports coming back on this one from the Star, Rolling Stone, the Herald, Huffpost, and Paste, it sounds like this film is the best kind of self-aware, and just good, clean, stylized, raunchy, violent fun.
Personally, this could be the worst movie ever and I'd still see it. I'd watch Tom Waits paint a fence; Christopher Walken rototill a garden.