If you somehow missed this, Michigan Stadium is undergoing a major renovation and expansion. The following description is straight from the U of M project website:
The 400,000-square-foot addition includes two multi-story masonry structures on both the east and west sides of the stadium; the end zones will remain open. The structures, which will stand 10 feet higher than the current scoreboards at their highest point, include 83 suites and 3,000 club seats.
Construction is phased over the next three years and will be completed prior to the 2010 football season.
The U of M has several website offering a tremendous amount of information.