I don't really see any major advances on ereaders. Minor software updates, maybe a larger unit. What more do you need from a dedicated ereader?
My minor improvement would be more options on how to organize your ebooks, especially when the account is shared by multiple family members. It's pretty clunky the way it is and while that partly may be how I understand how to use it, I see plenty of complaints from you folks who DO know how to use it.