Hi guys there is an Introduction to the new Skin Enhancement System implemented in the latest iOS Update.
There is a Guide on Android Forums with a run down of how it works found in this link:
You enter the Skins Screen via the Hero Compendium.
Any extra Skin Scraps you have for a Hero can now be used to upgrade the corresponding Heroes’ Skins.
Each upgrade consumes Skin Scraps and Shards and produces a different effect.
Skins can be upgraded to Level 10
For a more detailed version please follow the link above.