pixperfect: Fact, the D750 is not a replacement of the D700 but only an upgrade of the D610. The front monocoque is carbon fiber reinforced PLASTIC, so be careful! I don't think that front monocoque will last very long, especially when using heavy zoom. Small prime lenses are recommended. Nikon just saved tons of money!
Your comments about 'plastics' are sadly misinformed. When you re-entered the atmosphere, the realization that plastics have taken over manufacturing process must have been tough to take. When I think of plastics and carbon fiber composites, I think in terms of Glock and Smith& Wesson. If plastics can handle the recoil from a .45 auto, anything a camera can throw at them is a vacation. BTW B.M.W. uses plastic composites for the EXHAUST manifolds on their MINI's...at 1000+ degrees...think it's tough enough to hold a sensor and a lens?