Trailer here:-
http://www.youtube.com/watch?v=fPC-5VoCkNE
Looks like a cross between "Lost Boys" and "The Circus of Dr Lao". Also looks like it could be a lot of fun.
Out in the UK on the 23rd according to imdb. Also according to imdb the main character is a young boy called Darren Shan, so guess it must be based on his books.