A lot of it is shrouded in secrecy I'm afraid, unless you're doing the research. I'm also very interested in memristors, I think it's a quantum leap forward for computing, in many respects. But there's very little information one can get out there. Would love to know where I can find out more.
The top comment mentions DARPA research, but for those who are actually interested in the theory behind the memristor and its potential applications, here [1] is an excellent resource by the man who discovered the first physical memristor.
Furthermore, there is a huge amount of open access journal articles and wikipedia material on memristors. DARPA is nowhere close to the cutting edge, SK Hynix is already tooling ReRAM fabs for mass production.