pretty damn curious as of several years ago.
It isn't and Ethernet port, its a Phone Jack... and honestly i think the whole pedal thing would be cool but i don't think it would be extremely successful.
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you are inaccurate its a ethernet/phone cable
Okay Let me answer thi for you the plugin is its for an ethernet/phone cable so you plug it into the guitar and into the side of you pc or laptop then it makes it compatible with the pc version of the game instead of playing with the keyboard also if you own guitar hero 3 xbox 360 disc then you can put it in your computer and it allows you to play it on your computer
Was originally for an expansion pedal. no-one ever designed one though, and I'm pretty sure it has been dropped from recent models.
If you liked the idea of RB foot pedal here is one that engages overdrive (only compatible with rb2)http://www.engadget.com/2009/05/28/electro-harmonix-overdrive-pedal-just-became-a-rock-band-2-neces/
It is for the rumored/confirmed guitar hero effects pedal.http://www.joystiq.com/2007/03/31/guitar-hero-effects-pedal-confirmed-in-360-instructions/