To improve its accuracy. Faster then the ones in the brand most notable for multi-axis tourbillons, Gruebel Forsey.
I am not sure that I totally agree with Nicolas that we shouldn't like to see more gyro models. I'm not too concerned however as they are only now starting to produce the gyro 3 so they are quite behind in their production. So hopefully they will not rush out another model. But who knows. The gyro 1 was ground breaking but if you compare that to the 4 it is a different piece all together. So who knows, maybe in the deep dark recesses of the Manufacture's skunk works department there is something new and revolutionary that will only further the line. This company does seem to have limitless possibilities. Think of my favorite series, the Duometre line. I've heard that there are other possibilities in development and I'm not worried.