As for the patenet sheets, I went to
www.theitquestion.com . GO to additional reading then patents.
As for leaving it out of the current model, think, you have just announced a machine that costs $3000, much more than what some will pay, and you want to add a feature that could add atleast $1000 to the bottom line, that would be bad business.
The will release the origional verson and then the Segway 2. There are probably a few prototypes floating around, but think here. They might have had to releas the lower verson because the more expensive one that can climb stairs might not be ready. The eStand feature was just implimented for the Segways in the past few weeks. It wasn't available for any of the Demo models at WDW or for testing at GE.