If anyone is at all interested, The Leaky Cauldron's podcast, Pottercast, did a recent episode describing Pottermore. There is a long segment on the ebooks. Apparently they're not familiar with them and make some erroneous, funny, and even some insulting comments. John Noe commented that nobody has a Sony reader

, Sony readers have flash and some other stuff.
They also talked about how it was interesting that because of the Sony partnership that they didn't make the ebooks a Sony exclusive. Jo didn't want that. And even these guys with their limited knowledge of ebooks stated that perhaps while Sony readers have a smaller share of the market that the JKR Harry Potter Sony relationship may widen the interest for Sony readers. It just makes perfect sense and reiterates what many of us have been saying all along.
Apparently, Melissa, who runs TLC & Pottercast was involved in Pottermore and she has lots of info on it, a lot of which she can't say right now. The episode is #241 for anyone who cares to listen. They say that the ebooks cut out all the resellers, no DRM (which we know) and that they will be watermarked, and they're somehow going to be able to be read on all devices but there were no specifics as to how or formats. No word on pricing either but, and I'm just guessing here, because there's no middle-man maybe they'll be a smidge cheaper.
Jo wants people to be able to read it on all devices and all of their own devices for those who own multiples rather than have to buy one per device because of proprietary reasons. I for one can't wait!!