Books Online topics in SQL 2008 (Katmai) are incomplete!
One of our Developer asked me this question that they are unable to find complete informaiton about the compatibility between SQL 2000, 2005 and 2008 versions.
The answer is yes, its obvious and don't worry this is a temporary feature as the current CTP for SQL 2008 release documentation aka BOL information topics are stated as pre-release documentation and is subject to change in future releases. Blank topics are included as placeholders.