I have been wondering if there are going to be any certification (MCP) changes when Katmai ships next year.  Fortunately it looks like a similar structure i.e. TS, MCITP levels.  There is a good blog entry on this here http://blogs.msdn.com/gerryo/archive/2007/12/11/sql-server-2008-and-certifications.aspx.  Hopefully the beta MCP exams will start soon.

There are two certification webcasts scheduled but these won't be happening until February 2008. 

http://msevents.microsoft.com/CUI/WebCastEventDetails.aspx?EventID=1032357067&EventCategory=2&culture=en-US&CountryCode=US

http://msevents.microsoft.com/CUI/WebCastEventDetails.aspx?EventID=1032357174&EventCategory=2&culture=en-US&CountryCode=US