Sounds very interesting. Im not sure how open it will actually be, if they just mean its using RISC-V's open design and its just lost in translation or if they are actually trying to make an open hardware ecosystem.
edit: I read a bit more, it seems to be a apache-like licensed software only processor that one needs to implement first, so basically something inbetween pre RISC-V and an actual chip. Still cool, but I was hoping it was a finished chip.