According to the Minnesota Harness Racing web page, the track should be open for business by 2007:
http://www.mnharness.com/
There is obviously bad blood between the group working on the harness track and Canterbury Park - look at the news page link at the above web page.
According to an article in the St. Paul paper, the land purchase for the project was completed last month, construction will begin in the spring with completion by 07, which corroberates the MN harness racing web site.