Total bull… First, photos of the Bike riding, you have a panel in the back with Niko Bellec’s name so if this would be in any way legit that would be GTAIV. With a map of Liberty City as well pretty obvious on the wall.
The silver panel underneath the TV could hide in-wall mounted cables to connect another signal like let’s say a PS3 or Xbox 360. I doubt it’s for only one wire that is not totally covered any way. Or a wireless video signal receiver.
I am a Wii fan but I clearly know that the Wii isn’t capable of such video quality, if GTAIV is running I doubt they would have a copy with signed codes to run on a commercial Wii (or have they moded they’re unit) and not a dev-unit.
Also, I doubt that Rockstar is obliged to play in a damp bricked wall room with what seems to be like a old school voyeur keylock on their doors.
I call bull.