TriBeca Films and Miramax teamed up because they really like combining a bunch of words into a single name, but also because they really liked Last Night and wanted to distribute it. The film stars Keira Knightley, Sam Worthington, Eva Mendes and Guillaume Canet (yeah, I don't know who that is either). So what is the film about? Let's ask an executive at TriBeca, shall we?
"'Last Night' is an absorbing and provocative story about relationships, past and present, temptation and fidelity. Beautifully realized by director Massy Tadjedin, the film is a fresh and compelling take on the age old issues of love and commitment. It is carried by the exemplary performances of the entire cast, making it a resonant and vastly entertaining experience."
What that actually translates to in terms of plot is beyond me. Relationships! That only describes, oh, I don't know, every good movie ever.
Source: Miramax and TriBeca Films