Updates to Portal have been released. The updates will be applied automatically when your Steam client is restarted.

Portal
  • Added valuable asset retrieval
Interesting...

EDIT: Oh look, a new ending!

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Also, new sounds:

http://www.youtube.com/watch?v=bVH75XVu5Go

Maybe...
Dragging robot = called 'Dinosaur'.

Cave sends it back from the future to save Chell. She's that important, hence 'valuable asset'.
NEW STUFF:

Thanks AlphaFox!

There has basically been a confirmed match for one of the dino images to the apollo program.

http://img10.imageshack.us/img10/6657/dino22.png
http://www.flickr.com/photos/twoseve...7623315938604/
http://i49.tinypic.com/24llpap.jpg
http://www.flickr.com/photos/twoseve...7623315938604/
http://img192.imageshack.us/img192/9044/apollor.jpg