The Iray Plug-in can support both Character Creator 3 and iClone 7.
"Iray ready iClone 7" will be made available in Q1, 2019. The Iray Plug-in will need to be patched at that time in order to be compatible with "Iray ready iClone 7".
See more info about the Iray Plug-in at: -
https://forum.reallusion.com/374900/Iray-Plugin-for-iClone-7-and-Character-Creator-3