Krescue is a tiny OS designed to provide eMMC backup/restore functions, as well as flashing OSes to the eMMC and many other uses and utility. It can be booted and run from an SD card, or installed to eMMC or SPI flash.
It appears user @SleepWalker was developer for the BSD images used on the Edges. Maybe you could send them a message and see what the plan is for the future.
Be interesting to see who made the image you linked to.