Ard posted news of the sequel very early on, but just yesterday the first trailer for New Kids Nitro went live. It features the New Kids battling a rival town full of idiots, drag racing, zombies, and really bad hair. Here's what Wikipedia has to say, take it with a grain of salt:
New Kids Nitro is an expected Dutch comedy / action film about the New Kids, a group of loitering Maaskantje, which will be released on December 8, 2011.
The film is the sequel to New Kids Turbo. Also this movie will be directed by the creators and protagonists Steffen Haars and Flip van der Kuil.
Although the story is kept secret, some events that take place in the story has leaked. Thus, the Railway Museum Area Foundation (MBS) reported that the New Kids have a request for a train with a freight car to rent the film. Zombies in that car would be transported. MBS rejected that request, because the transportation of people in a freight car too would refer to WWII. This would be bad for the image of MBS.