The upcoming
imcoV6L is pretty close to what I envision, though I'd prefer if it was slimmer. Also, something a little beefier under the hat would be good (I want to be able to run Calibre Companion and a custom reader on it), though that would probably drive battery life way down.
But it does have a lot of what I want: e-ink, capacitive touchscreen, physical page turn buttons on the sides, MP3 support with a 3.5mm jack and speakers, MicroSD slot, frontlight, Android.