Well with Skylake they appear to have merged the 4770k and 4790k into the 6700k. But I suppose you could view the 6700k as the 4770k and 7700k as the 4790k if pushed to make that comparison. It's quite likely that the extreme editions will be named 7800k, 7850k, 7900k and 7950x, with 6, 8, 8 and...