2009 is the current one. Those being sold under the 2010 label are just repackaged in anticipation of the new products when their beta testing is done, and will automatically download the new products once released. Actually they all will upgrade anyway as long as the subscription is current.
The actual 2010 products are still being beta tested. I voiced strong objections to this re-labelling practice but was told that it is common trade practice.
To me it's very misleading, but there you go, Corporations always win out in these matters.