>One I've been waiting for since 2008 is a general purpose epaper tablet
Although this might be not 100% what you want - you are aware that decent epaper Android devices e.g. from Onyx have been available for a few years now? Have a look e.g. at the BOOX Note Air2. Of course they are marketed as e-readers, and are quite pricey.
Although this might be not 100% what you want - you are aware that decent epaper Android devices e.g. from Onyx have been available for a few years now? Have a look e.g. at the BOOX Note Air2. Of course they are marketed as e-readers, and are quite pricey.