First of all, the icons are created as according to the images leaked about Kitkat in past few weeks. Here’s what Senior Member over XDA, OP says about it:
Hi to all, do you like the new wallpaper and icons that you saw on leaked images of kitkat?
I made a pack that contains all this things!
Enjoy the new Google Experience!!
So guys are you ready for the makeover? You need to downlaod the third party launcher to change the icons ( may be available in your default ). Guys don;t miss to share your screens after applying the so called skin (manually).
Download all the Google Experience pack from the source links below.