You may be able to find some real great deals soon on the '12-'15 models. The suspension is very nice and it has the '10-'13 YZ250F frame that everyone raved about. Will be interesting to hear about the differences in the motor. I get the feeling the newer reversed 4-valve motor will be a little more hot rod than the 5-valve motor. The newer YZ's seem to be the dragsters at the tracks. Still, I love that 5-valve motor.
I too am interested in hearing the differences. I sold my 05 wr a few years ago and was thinking about getting the 2012 generation bike. But the new bike has me intrigued, especially if it rides comparably to the KTM's.
But then again, a lightweight, very nimble bike would be wasted on a spode like me. I can hardly turn on my ktm 300 and I'm getting slower, not faster.
I'm expecting a blowout of the current generation wr's , which I hear are very good bikes in their own right.