Play games
Choose the game that interests you and play itfor free.
Complete the quests
Every game has some quests for which you will receive Soul Gems.
Receive rewards
You can exchange your Soul Gems for Steam Wallet top-ups, game keys, CS:GO Skins and other rewards.
Τhis is just a speculation, but since Shady mentioned rereleases as an issue and since i think as a mod he knew what is coming in December for xmas , in pretty sure there will be rereleases for this Xmas