I suspect this could be a good speed boost, with about the same learning curve as learning the original Palm Pilot stylus input.
If they wanted to put this on the iPhone (to reach a far larger customer base), app approval would be needed, but that is quicker nowadays, and the approval process also checks for malware which gives me more peace of mind.
...the patents contested by Microsoft cover very specific areas such as “Method and system for mapping between logical data and physical data,” “Method and system for stacking tool bars in a computer display,” and “System and method for providing and displaying a Web page having an embedded menu.”
Amazing what you can do with an immense development budget.