There is absolutely nothing new in this set at all. The vehicles are all re-paints, and the figures from recently retired sets.
Anyway, there are 3 vehicles in the set - a truck (Unimog), a bulldozer, and a towed conveyor belt:
Strangely, all the wheels on the vehicles are of a different design to the ones on the box, so I don't know whether they changed their minds when it was put in production, or mine is a later set where sometimes things like this are changed.
There are four attachments that can fit onto the rear of the bulldozer: a winch, a ripper, a tow hitch, and another type of hitch. As usual thses are all compatible with the front and rear of the truck (apart from the ripper due to it's size):
The bulldozer is one of my favourite construction vehicles, and the main reason I bought this set is because I didn't have the oroginal. It looks absolutely fab with the winch on the back.
Bill Blackhurst made a great custom from the bulldozer:
http://www.playmofriends.com/forum/index.php?topic=4010.0