The Boyue D81 features an 8" IPS display on its front and an 8" E-ink display on the back, and if it is ever built it will run Android 4.2 Jelly Bean on a quad-core CPU. It will probably also cost a lot of money, somewhere in the neighborhood of $300 (by my guesstimate).
I don't know that Boyue has worked on a dual screen design before, but they have developed a couple Android tablet as well as a couple ereaders which run Android. So even though this device presents twice as many technical issues as a single screen tablet, it's entirely possible that they could pull it off.
I'm going to go start bugging them for a review unit. Yes, I know it doesn't exist but sometimes it pays to get an early start.