What if we're not interested in performance differences? I'd prefer to buy a board that doesn't have odd issues with reboots or high-voltage memory, so I'm hoping that the C2 stepping goes towards solving these issues.
Also, a forum poster at HardOCP claims to have recieved the C2 stepping on a Gigabyte DS3 through Newegg. I can't find the posting right now, but if you refuse to wait any longer, this would be your best bet of finding the chipset.