Potato Pack Steam Sale an ARG?

The "Potato Pack" on steam was leaked at christmas time. Potatos; a fitting april fool's joke. But..


This was found inside Defense Grid, and is unrelated to it. And was only found as of today, with all the potato-y awesomeness they added to potato pack games. It also has a locked campaign called "C.H.A.S.", although that could be simply something related to potatoes. Notice how it's an IP link.

Portal 2 achievements were also leaked today. And..

http://www.xbox360achievements.org/game/...-Tote.html

Valve, in an interview also said they had something planned to link the timeframe of portal 1 and 2. Are we here, now?

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Some things people pointed out:

 Similarities?

 Crackpot theory is amusing