The following is the commercial which debuted at 8:30 P.M. of GE's Back to the Future themed ad. http://www.youtube.com/watch?v=1QN79EvD_V8
This video was originally posted by TranceLikeState in the shoutbox!
See more information on when it aired here: http://beyondthemarquee.com/24344/
Update 9/9/2013:
TMR's Andrew Wells edited the audio of the GE commercial to be more familiar to Back to the Future fans! Check it out:
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Here is a post from the DeLorean's owner on Facebook confirming that Michael J. Fox was in the commercial, and that he narrated it:
[The name and profile picture have been blurred for personal privacy]
EDIT: Here is a very recently posted comment from AJ LoCascio that also confirms the fact.