9to5Mac claims that they've talked to a few content publishers (magazines, newspapers), and those publishers are claiming inside knowledge about the device. Most importantly, that it'll be "[nowhere]near $US1000, as has been reported elsewhere."
These publishers 9to5Mac talked to didn't actually see any prototypes, but it was described to them as a 10-inch glass screen that's smaller than a Kindle DX, but "with a similar weight". That the software is going to be the "game changer" is nothing new, but Apple's supposedly going around describing the tablet in comparison to the Kindle as the change from black-and-white TVs to colour.
Other interesting bits: Current ebook distributors on the App Store now are going to get screwed once Apple's official one hits, and don't expect a lot of content until "mid 2010 at the very earliest". [9to5Mac]