Hello Pavel,
we’ve started development of E-ink module a week ago. We expect some prototypes in a month from now.
Size - Big module, format like cover module
Display - WaveShare - don’t know the exact type but it will be the biggiest that will fit. We will use 2 color display because of much faster refresh. But WaveShare is using same connectors for all its e-inks, so it will be possible to connect different sizes and types.
Module will have 4 buttons.