Looks like the larger screen - except for PDF and image viewing - is largely wasted. You can put more text on the screen by choosing smaller text size, but then the line length is too long to be very readable. Should be an option to split into two columns, at least when in landscape mode - I didn't see this ability in the user manual.
Also, they really need to add better Unicode display support (Cyrillic, Chinese/Japanese/Korean) if they are targeting educational. While they are at it they can add this to K2 as well. Guess we will know when they ship, but it would be nice to know before that.