Patch 2.2.0 brings character skins, trade center and golden/silver nicknames for the early supporters.
The list of skins:
• First Infected Skin for Survivor
• First Infected Skin for Rover
• Supreme Skin for Survivor
• Supreme Skin for Rover
The skins are available for the early supporters of the game. To activate them, you need to go to the game settings and enter your serial game key. After that you will receive items to your Steam inventory.
If you don't remember the key, you can request it here:
https://www.humblebundle.com/resender
You can also sell your skin or golden/silver nickname in Trade Center.
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Also please note that you will receive your reward depending on the package you purchased earlier (First Infected Edition or Supreme Edition).