Haha, Elon doesn't strike me as a Yay-er, but I'll Yay with you. I wonder if this means it's further along than the S we rode in back in 2009 (compared to what's on the road now). I guess it would have to be since the production would have to be locked in about a year and 7-8 months from now.
It's pretty obvious that they are in a better position now to build a highly realistic prototype. The Model S prototype was built on top of another manufacturer's frame; it only looked like a Model S. The Model X prototype is derived directly from Model S. So it could be extremely close to the production design.