the tv thing is possible in source engine. like in HL2 where the bloke is on the big screen talking, I am going to bet that the physical(in the source engine) model is somewhere in the map with a source camera pointed onto him and then its being displayed wherever the screens are. It was even in the huge HL2 demo vid earlier this year. we might have to wait for the full sdk though unfortunatly
But it would be nice to have real screens in cs_assault in the back of the CS truck instead of having to switch to a full screen camera view.