On this photo we see a Scania test truck and this looks like a medium size truck. Word is that Scania and MAN are developing a small truck but that would be an even smaller truck up to 6,5 ton. This looks more like a 12 ton truck to me.
For the engines Scania is working with Cummins ISB engines for Euro-6 busses. The Cummins ISB engine has a capacity of 6,7 litres and is available up to 310 Hp. One of my informants says this engine is also going to be installed in the new small truck. When it is a Scania-MAN development the choice for the small MAN engines would make more sense.