I'm baffled by this. The usually reason why hardware developers create FPGA dev boards is so that the software stacks can be developed in parallel with the hardware. But Tachyum are providing an emulation layer so customers wouldn't need to modify their software, even if they wanted to use Tachyum's ISA, it would just involve recompiling (assuming they upstreamed to LLVM or gcc...).
So why release this to customers?