The biggest change in the new version of Blackboard that will be available in Spring 2007, is the redesigned discussion board. The discussion board tool, found under communications in each Blackboard course shell, has been redesigned to allow faculty to "grade" student discussion board posts, a new subscription option for individual threads, better administration tools, and a new peer review/rating option where students can rate the posts of others. It also has a different "look" in the way that it displays user posts.
OIT has developed some flash movies that you can view to better understand the changes that have been incorporated into the new version. You can view the movies by going to here for creating a new forum and here for managing threads.