I'm wondering the same thing. Looks like it will cost about 10$ and an hour of solder fumes to build this... just need to know how to flash it, and if the code released is compatible with this the Atmega164PA.
so, as nobody answered you till now: why should this controller work ? it DOES NOT have an usb-interface !
the code does really not need much, just a controller with free programmable usb as it uses own id´s . the atmels are able to habe 6 ids with each its own buffer. and more they dont use - besides the led, which is obselent.