I'm afraid I have to politely disagree. A manual is I think essential to a system this powerful and complex. (A manual does exist, but not for CUE V2. Find it here: http://www.pdf-manuals.com/corsair-k95-rgb-mechanical-gaming-keyboard-ch-9000062-na-305535manual.)
I almost returned the 95 keyboard last week from frustration similar to what Dauthus described. It's not just the mystery keys; it's more about the complex CUE UI and the many options that are either invisible (sometimes) or difficult to understand. I'm glad I didn't return it, though, because once you've figured out some of the UI, the keyboard becomes quite a time-saver even if not used for gaming.
After spending several hours bumping around trying to figure out how to do a few simple things like creating actions that launch programs, I got tired of the missing v2 manual. The existing one has pictures that don't match CUE 2, features that don't work the same as described, and so on.
Having worked in the computer field for three decades, I've discovered that many of my fellow nerds believe that clear, simple explanations of basic concepts are not necessary. Perhaps even insulting. They also sometimes confuse the newbie's lack of knowledge with a lack of intelligence.
Perhaps Corsair is working on updating the existing manual. And they will then put the .PDF file for it on the same Web page where you download CUE 2. Until then, we customers must root around the forum, YouTube, and so on...piecing together what I hope will eventually be a comprehensive, clear, manual with step-by-step walkthroughs for all the features.