no screenshots whatsoever, but there IS leaked information from out of Valve !

Valve is currently looking to voice over the what seems to be bad guy from Portal 2.

It's Cave Johnson, founder of Aperture Science, in A.I controlled form.
Seems it's gonna be an interesting replacement of GLaDOS.

More information on:
http://kotaku.com/5014851/rumor-casting ... -2-details

For those crying for the return of GLaDOS (Wich is not so strange, it's a unique game character).

I think she'll return in HL2 Episode 3
On board of the Borealis.
That's what I think!