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.