Hong-Kong based Carisma racing introduced their first ever competition 1/10th scale buggy at Nuremberg Toy Fair. I am not an expert when it comes to micro racing buggies, but as the Carima GTB seems to be the car to beat in this class, the 4XS won't be bad either; having been designed by Revolution Designs' Michael Vollmer also helps, of course!
Here are some pics courtesy of
http://www.rc-news.de , and a nice Youtube video by Carisma themselves:

From what I heard, the center diff and slipper both are included in the kit
http://youtu.be/RRJqHY6ViGs