Earlier this year I wrote a blog on some of the new features that are included in Exchange 2010 Service Pack 1 that is due for release later this year. See blog post: https://demazter.wordpress.com/2010/04/08/exchange-2010-service-pack-1/
If you cannot wait for the official RTM version to get your hands on some of these new features then Microsoft has made the Beta version available to download from: http://www.microsoft.com/downloads/details.aspx?FamilyID=a0965fc9-2723-4947-ae6b-74bc3808e72a&displaylang=en
Please note Microsoft do not recommend running a Beta product in production and if you intend to do so this should be done with caution.
Watch this space for how the Beta compares to what is expected. I will be installing it in my lab later today.