Little secret the Cinema EOS C500 is not a big seller for Canon. It is over-priced and a bad value for the money. Unlike the highly successful C300 Mark II 4K camcorder, which had its price lowered to $9,999 recently.
So back to the labs for Canon. The C500 Mark II version is in the works and will have resolution higher than 4K but not 8K, although Canon had previewed an 8K Cinema EOS prototype camera in late 2015. The new C500 Mark II camera will command a premium, perhaps in the $13K to $15K range.