So apparently, by playing games in the 'potato sack' group you help move up the release date for Portal 2:

Chart here;
http://www.aperturescience.com/glados@home/

Explanation Here:
http://www.rockpapershotgun.com/2011...up/#more-57162

Potato Farming Guide Here:
https://docs.google.com/document/pub...&pli=1&ndplr=1

CR