Another article with a video:
http://www.engadget.com/2012/05/25/leap-motion-gesture-control-technology-hands-on/No specific info about hardware yet, because of patent applications the article says.
There is also talk about possible integration of the technology into laptops, desktops etc. ("the plan is to get it baked into laptops, desktops, smartphones and tablets").
I don't think fatigue will be much of an issue. Elbows/forearms can be rested on a desktop and if it is very accurate, I guess you can just configure the sensibility of it up to a certain point, so only very small motions of the hands/fingers are necessary to control stuff on the screen.
I like the idea of connecting two or more of these to create more '3D interaction space'.