Thanks for the update Dmitry.
From a high-level product standpoint I'm very happy with what I'm seeing in both of those screenshots. I probably slightly prefer the grey (the solid black looks a bit glossy on my tablet in experience, which defeats the point a bit), but it's primarily a design issue and I'll support their choice.
Would you like some input from me before it hits the signoff column? I'm fine either way, but if you want some quick input from me on your work-in-progress build just send me an APK and I'll take a look. :-)
Dan