Apple did not lie about the size of the iPad Pro 10.5 Smart Keyboard size. It is very close to a full size keyboard. Here it is in comparison to a keyboard on a Macbook Pro 15".
Here's a comparison of the new Logitech Slim Keyboard Case
The keys are all positioned where my fingers would expect them to be, but just barely. This is the reason I can actually type on the 12.9" iPad Pro. My daughter is going to be relieved when I can finally stop stealing her computer.