I am late to this thread...
But, From what I've seen it is an interesting device.
I would like to see pressure-sensitive styluses on larger form factors and more main-stream devices such as the iPad.
Apple has a patent where you place your fingers on the touch surface as if you were holding a stylus -- software triangulates the center and you could draw or write as if you actually had a stylus.
There are apps out there that measure pressure by changes in size/movement/speed of the surface area occupied by the fingers.
I saw a prototype of one app that was able to detect the touch areas made by the palm, heel of the hand, and other fingers -- so their extraneous touches could be ignored.
So, you might be able to do much of this with current hardware and some speciality software.
However, I think there is a use for a pressure-sensitive stylus and a more-granular touch digitizer.
Uses include an iPad alone or with a Mac:
-- as an alternative to a graphics tablet for artists drawings and architects
-- as control surface for A/V editing
-- a telestrator for video
-- real-time video marking of video during ingest (there are cameras that send a WiFi proxy of the video to an iPad as it is being captured)
There is also potential to run VNC remote apps/desktops with more precision -- where you could run Full Windows, OS X, Office, Photoshop, Final Cut from a remote iPad and navigate a UI designed for a kb/mouse.
You get some interesting gaming and entertainment possibilities among iDevices (including the AppleTV) when you consider bi-directional AirPlay, telestrating, drawing, etc.
I remember going to a SigGraph show in the 1980s where there was a booth with a large TV attached to a computer. It was displaying a remote Artist, standing with a palette, painting a scene.
The interesting thing was that the guy at the booth was able to zoom in on the palette and mix and change the colors of the paint while the artist was painting -- the displayed image reflected the changes in real time.
Think of something like that in the hands of someone watching TV...
-- Old Yeller becomes Old blue
-- The NASCAR Number 96 car becomes a vivid lime green... booggity, booggity
-- You glow-highlight the image of specific players during the game
Or something more mundane as a hair stylist drawing/modifying various alternatives on a live video of the customer.
A dress or set designer composing/refining their work in real time (would the models need to be naked?
A virtual-reality set of hand crafted custom Christmas decorations for your house.