Another tome on the Windows 8 blog on Designing the Windows 8 touch keyboard, going into tons of detail on testing, metrics, and how they ended up with the design they have.
Best is this comment from “Swotboy2000”:
So you wrote this article basically to say “we’re going to have something VERY similar to the software keyboard from iOS”? Seems like you could have saved a lot of time and money on research just by copying.
It’s true, I admit I only skimmed the article, but I was looking at all the screenshots and looking for anything that’s different from iOS (other than the styling of the keyboard), and couldn’t really find it.