Trading Cards are ready and will be available soon. They are under review process. So, It might appear today, or tomorrow, but soon.
There are 5 Badges and 1 Foil Badge, Crafting each badge will give you 1 wallpaper out of a collection of 5 wallpapers*, and/or 1 emoticon out of a collection of 10 emoticons*. The play time to earn a drop is really low, and you will figure it out.
*numbers might change after review.
You can check out a preview here at Enter Main Loop's twitter page