Does anybody have a source as to why these awesome things didn't make it into the game?
The pneumatic diversity vent: http://www.thinkwithportals.com/media_05.php
This level: http://www.thinkwithportals.com/media_07.php
Is it possible the game could be updated with this content in the future?
EDIT: It's as if I knew about it, except I didn't