In June 2014 (exactly two years ago), E Ink and GDS announced the world's largest e-paper module, a 32" 2560x1440 display that targets digital signage and information kiosk applications.

A few days ago, E Ink and GDS installed a prototype 32" solar-powered E Ink display on Boston's City Hall Plaza. The sign will provide information on local events and help residents and visitors locate nearby landmarks

This display is still considered a prototype - it's not clear when E Ink will start offering such displays commercially.