Even if you didn't know everything points out to the previous "entry" that was called East is east. So they thought they'd make another movie with immigration and other problems crammed into one movie. Actually the movie has really high ambitions trying to light even the grayest of areas and everything that surrounds it.
Unfortunately though the ambitions might have been to high to reach. It's not a bad movie by any means, but trying to juggle all the threads of the story proves to be more than difficult. It does seem to stir away from time to time instead of focusing on certain problems. Which in itself wouldn't be a bad thing, but again it doesn't have total control of everything that goes on, which might leave you with an unsatisfying feeling.