It is coming soon that i7-4790K ( Devil's Canyon) will be available. At the moment , the Gigabyte homepage shows us that the BIOS F8 of Z87X-OC supports the i7-4790. So, I really suppose that coming 4790K will work as a 4790 on Z87X-OC with higher overclocking availability ( ex. x1.25 gear up ).
Plas advice me if you have any big idea/hints/tips.