http://store.steampowered.com/news/3533/
Soon afterward, a new achievement appears:
http://steamcommunity.com/stats/Portal/achievements/
Then,
And shortly after, radios start popping up in Portal:The aperturescience.com flash changed. Before, the INTERROGATE command, when given a parameter, gave an error about 'illegally initiating diciplinary action'.
It did this on a random account, as well as on cjohnson account. Now when using the command as cjohnson and giving it a wrong parameter it says "employee not found".
This thing wants a name.
As far as I've been able to figure out, you find each radio (26 total across the game) and bring it to a point in the test chamber. As you approach these areas, the static of the music playing increases. When you arrive, the light on the radio turns green and what appears to be morse code comes out.
Some decode into messages:
http://forums.steampowered.com/forums/s ... ?t=1169084
Others, using a very specific program which translates sound coming from your sound card into images, produce.... images:
http://forums.steampowered.com/forums/s ... ?t=1169218
Your mind was basically just blown.