Piece by piece, Valve are currently in the process of releasing the E3 Portal 2 demo for public consumption -- the pre-recorded demo that games press were treated to in the Valve E3 meeting room a couple of weeks ago.
The first clip introduces a new character named Wheatley as well as the return of the always hilarious GlaDOS while the following two videos demonstrate some of the new gameplay mechanics. Hit the links below for the videos.
For more details on Portal 2, stop by our preview write-up
for an account of the complete E3 demo.