To answer the question "Would you be interested in a 6'' device with touchscreen" - yes, I would. IF it supports ePub, HTML and PDF.
I'd be more interested in a device with touch (if it can be switched off) then w/o touch. Still: For a 6'' device its not the most important part.
I'd love to have a small (say: handy sized) e-reader with a foldable display (say: 5'' or 6''), without any extras (nope, don't want UMTS, just gimme a good reader) - for simple reading on the train. Oh and please with a big "turn page" button on each side of the device! Replacable battery is a "must-have". (Fine-tuning font-sizes would be nice, but is not needed). The foldable part would be nice, but is not a must-have.
Then I'd love to have a ~10'' (or A4 foldable to A5, if possible with "two A5 display option"
) with touch screen. In addition WLan is a must-have, 3G (UMTS) would be very, very good. Feel free to put in whatever else you can fit (Minivan, stargate, fusion reactor, ..)
I'd very much like to see some "font-size fine-tuning" (you need nothing more then 4 'direction' buttons for this...)
I don't really care about "cheap umts" or "built-in free internet access" for a professional device - just let me insert whatever SIM card my company provides, and it's okay. (Of course, it would be acceptable to be able to plug in 3G modems via USB, but I doubt that anybody could (reliably) solve the related software problems (in a generic 'all modems, all providers' way).
And while Santa is listening: I'd really love to see a device that packs two displays (alternating reading) with the option to link them together. Even better: Make that two readers which can be linked together to form a single unit with two screens or one large screen.
Must go now, the Easter bunny is calling