Is grayscale achieved by dithering algorithms inside the FPGA controller or is this some other E-Ink wizardry that actually can handle grayscale pixels? I mean

Is grayscale achieved by dithering algorithms inside the FPGA controller or is this some other E-Ink wizardry that actually can handle grayscale pixels? I mean there was a HN post about a full RGB-E-Ink display last week or something. Any spec or pricing is behind a NDA, though. EDIT: Nevermind, they explicitly state it's 16 level grayscale.