As soon as I heard this i decided to do a little investigating and this is what I found.
http://hellforleathermagazine.com/2008/10/ktm-presents-electric-enduro.html
I have yet to see any video's of this KTM in motion but I also found an interesting company in California that already have something similar (albeit extremely ugly) on the market.
Zero X
www.zeromotorcycles.com