I hope it is a really great camera, and sets some new standards. Will I switch? Nope. I love the competition that will make things better for us all.
Frankly I wish Nikon well, but I'm not that interested in what they do. To be honest, I have a lot invested in lenses, bodies, giizmos, etc., and I spend a lot of time and effort improving my photographic skills. What I have discovered is that it isn't the hardware that is my limiting factor.
Improvements in technology will help me get better, but so far, my beloved 5DIII, pooped on or not, still has plenty of head room for me to improve.