Pixel C - First truly innovative Surface-like device I've seen since the Surface.
Not trying to be a jerk here or anything, but what exactly about the Pixel C is "innovative"? The whole charging of the keyboard via induction from the tablet is nice, but it seems like a better solution is a keyboard that never needs to be charged at all and is powered by the tablet directly. Plus you can make the keyboard slimmer since you need very little extra electronics, e.g. battery, charging circuitry, bluetooth circuitry, etc.
Outside of the keyboard charging method, seems like its just another run of the mill android tablet. No stylus support, no built in and widely supported multi-tasking modes, and the worst of the three in terms of tablet optimized software.
I think one point in the iPad Pro's favor that's overlooked is the fact that the smart connector is at least partially open to third parties, and based on their wording will eventually have a published spec. Logitech has already announced a keyboard, and I think it's safe to assume there will be more eventually, along with who knows what other kinds of accessories. This opens the door to have a plethora of options, which will make the cons of Apple's keyboard cover essentially moot.