I'm an artist and the invitation image spells content creation as a main selling point in my humble opinion ;-)
If the product does content creation (hopefully as responsive as sketchbook pro on a Wacom), and does it well, I'm sold!
All the other consumer ebook/web stuff will come as standard but in an apple refined fashion.
My guess is the exact opposite.
Content creators need powerful applications, desktop operating systems, large screens, keyboards, mice, graphics tablets, USB ports, RAM and CPUs.
Apple already make a range of such devices. (Macs) And don't want to undermine those sales with a cheaper alternative.
If the rumors are to be believed, a tablet device will be small, light, super easy to use. It will need a custom OS. With its own interface. That means no Mac OS X. No Adobe Apps. No Office. Productivity applications and content creation will not be easy on such a device.
I think this points to content consumption. It will be a media player first and foremost. Movies, books, games, social networking, web. This is Apple's SafariPad finally seeing the light of day.
If you look at the ad, it does not scream "professional", it resembles other iPod advertising imagery. And even the colors precisely match the colors of the current iPod Nano range.
C.