I haven't found a thread about this but lots of links scattered in the pre-order threads, so I'd like to gather those here.
http://www.geeky-gadgets.com/dragonbox-pyra-open-source-pc-handheld-games-console-02-05-2016/
http://obscurehandhelds.com/2016/05/pyra-pre-orders-go-live/...