tpruvot has released a new version of CCMiner with support for Cuda 9 Release Candidate. You can view what is new with Cuda 9 RC here. My initial testing with Monero mining does not show a noticeable increase from 2.2 to 2.2.1.
You can download the latest release here: https://github.com/tpruvot/ccminer/releases/tag/2.2.1-tpruvot
Update: CCMiner 2.2.2 has been released.