Valves new game portal has released its first video, honestly the game looks sweet, looks like a rip off of prey, but honestly it looks better then prey, if they put the portal system into another game somehow i think 3drealms will sue lol.
http://media.pc.ign.com/media/842/842671/vids_1.html
http://media.pc.ign.com/media/842/842671/vids_1.html