This is exactly what interests me. I keep 20 servers in colocation facility because I have I/O requirements that can't be reliably met with EBS. Solve that problem and I'll move as soon as my colo contract term expires.
I keep hoping that somebody will do that, hook the other end to an SSD target, and sell me a 'high I/O' node. I want to stop dealing with hardware and colo facility contracts and I doubt I'm alone.