The one seen here is just a patent, but you know that the patent is that after leaving the new devices. In this case, the idea is from Microsoft and is based as seen in a modular phone ie a phone that can be built with different parts to add or subtract.
The idea is not new, indeed we have already seen something similar by Sony Ericsson with its Xperia Play, although in this case the first impression was modified to stay in something more classic.
However, Microsoft has designed the new idea based on the world of consoles that Sony Ericsson had already begun, but for now these components are held in removable cell phone that will make it more functional depending on what you need it at any time.
Obviously the novelty of the matter that makes us uauh, but if you stop to think that the functionality of the phone can rely on us to take us four interchangeable keyboards can be a problem big enough space what do you think?