Memristors are not some magic stuff that suddenly makes FPGAs as efficient as ASICs, nor do they make then dramatically cheaper.
I really have no idea what you even mean with a "developer version". Memristors are just circuit elements. They are laid out in the billions on a wafer and connected together with copper interconnects -- just like normal transistors or the floating gate ones used by flash. They could give devs early memory devices or something that uses memristors for logic, but other than having the word memristor on the top, they would not differ from similar devices built out of transistors and silicon.