It's too bad they're going to cover the X2 rotor hub with a fairing. That rigid rotor hub structure is a real pretty piece of design work. I wonder if most people really appreciate how difficult it is to design a lightweight hub structure and pitch bearing mechanism capable of handling the huge moment forces produced by a rigid rotor. It was likely a difficult design problem at the small scale X2 demonstrator. One can only imagine how hard the problem will be to solve with the exponentially larger moments imposed by a larger diameter rigid rotor.
Don't know what's in store for the X2's future though. It was dropped from consideration in the JHL/JFTL program. Apparently it didn't fare too well against conventional tiltrotors in the JHL trade studies. To make up for it though, it looks like the program management threw Sikorsky a bone by suggesting they dust off their VDTR concept.