There has been talk of Elk in WI...here's a few links that explain it better than I can:

http://dnr.wi.gov/org/land/wildlife/elk/index.htm
http://dnr.wi.gov/org/land/wildlife/elk/Plan.htm

There is actually a committee in WI regarding Elk, called Wisconsin Elk Study Committee (WESCO), but what they're doing these days I have no idea.
http://dnr.wi.gov/org/land/wildlife/elk/map.htm