Valve’s latest economic experiment. Valve has announced the start date (and time) of the 2014 Steam Winter Sale, and come up with a way for people to recycle unwanted trading cards. The Steam Winter Sale date is confirmed as 18 December (at 10am Pacific)...
"The 2016 Steam Winter Sale is live!". That's what I'll say when the next Steam sale actually goes live. According to this thread on NeoGAF, which contains an image presumably taken from a developers-only group, I will utter those words sometime around 9:50 am PT on December 22.