From the BeagleBoard.org Foundation blog:
Google Summer of Code project videos
Watch the introduction videos from our Google Summer of Code 2017 students including BeagleWire software support by Patryk Mężydło
Checkout hackaday.io more information on the cape:
BeagleWire
The BeagleWire is an FPGA(Lattice iCE40HX4k) development platform that has been designed for use with BeagleBone boards.
mwelling has shared the board on OSH Park: