Twice as good? Like the first YotaPhone, the successor also features two screens. An AMOLED screen adorns the front, and an additional eInk screen is on the back. The Russian company has completely reworked the design, and has also done many things better than in the precursor. However, the temperature development is still a problem.
http://www.notebookcheck.net/Yota-Devices-YotaPhone-2-Smartphone-Review.134637.0.html
I have to add to this review that even though Yota Devices is a Russian company, the YotaPhone 2 is developed in Oulu, Finland by ex Nokia people.
"we would wish for a backlight that can be enabled optionally"
I don't see the point. Adding backlight for EInk will add weight and thickness and already there is main screen with backlight. So why would you need backlight for eInk screen if you can just flip phone and continue reading?