MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.
That is exactly what you are seeing there. It works very well but I learned the hard way that running any high-current through there (in my case, the extruder) was a bad idea. Anyway, DB25 is more than sufficient for X, Y, Z, and Extruder motors, as well as end stops, a fan, and if needed a couple more sensors. The trick is to use a common ground for the end stops on the plug so that you can save a few pins.