A touch device based on Mac OS X would require a lot of reworking the underlying GUI. Such a device can't really be "released to the masses" without developer input and retooling.
It will run the iPhone OS and have the App Store!
Why in the WORLD would they take on such a monumental task of completely reworking OS X when they already have done that, and have an app store and developer support and a hugely powerful infrastructure already in place???
That's my problem... is there a market for a 8-10" touchscreen? As far as I can imagine, touch screens are useless for any real productive use (notes, presentations, etc.). Apple must be designing this touch thingy for a particular type of consumer... but who?
You are all thinking about this inside the box... The demographic of netbook user here is secondary. The main target for this product is to tie in with the Apple TV and Media hub that is in the works!