Well I'm assuming it would change how it produces the audio through the output device much like when you select the headphones option in a PC title. I'm not sure of the specifics but it would most likely be a change in the treble, bass, channels used, etc.

It is possible to listen to a tv through headphones, some tvs and most stereo systems come with a headphone jack right in them.

Anyways, I am fairly burnt out on AC but if they present some compelling content I still may pick it up.

Favorite game including Wario in it.. Mario Kart Wii. Starring Wario would have to be Wario's woods just because I am a Puzzle game freak.

Buttons cost a lot less than a standard casing. Check out the games that pay tickets at an arcade sometime. They use light up buttons a lot of the time for the low ticket indicator light.

They missed a good one on Sky Garden thats to the left (needs mushroom) if Waluigi hadn't taken the first jump to the right although its not official. There are more turns like that in the GBA Luigi Curcuit. There are a ton more that are somewhat of a given like that patch of grass to the right of the bridge in Donut Plains 1(can be snaked but a mushroom is obviously more efficient).

Does no one know about Gears of War?? That game would definitely be the reason of the large spike in sales.