They look good and received some good initial publicity. Something I'm mulling over as I need bindings for my Völkl and Blizzard skis, eventually for the 13/14 season.
Nothing has been "proven" that the X-cell's are better. The toe does appear to have more lateral elasticity than the previous design but the heel (specifically the 16) doesn't seem to be as substantial.
Yo can see here that the metal base of the NEW Xcell is visibly wider than the outgoing 16
As far as the toe, the red cylinder is for shock absorption. The wings are also longer for more elasticty and now the toe incorporates a sliding (plastic) AFD a la Jesters and Griffons vs. the whole sliding metal plate again from the previous generation. The other huge difference is a lateral spring vs. the longitudinal one.
Again, I said nothing has been "proven" either way. The outgoing heel is metal, the new one is plastic and the pivot point is now hollow vs. the solid one where we have seen no problems with breakage. I think we will see more stout features on the 20 which we are told is still a year out. I do think the 4 screw pattern is a big change with the 4 screws being under the toe verses the 3rd one on the old one being back behind it.