I posted this in the hashfast thread:
My hashfast contact and I have been working on the cgminer driver for a while for this protocol, and fortunately since they contacted me early, their final protocol is quite different to what they originally had in mind. I'm very pleased with the design overall, and the cgminer driver for it we've been working on will be pushed to a public repository tomorrow.
To be fair, cointerra had contacted me effectively even earlier in their development process than hashfast, so I'll have had even more input into their final protocol and driver design.