Wow, I'm really bummed. Sure looks like it's 3 more exams after finishing the 2008 MCITP. Below is the upgrade path for the SQL 2008 DBA cert. I'm still going to work hard to pass the 70-450 but it doesn't reduce the total number of exams I have to take. Drinking a skinny mocha to dull the pain...
http://www.microsoft.com/learning/en/us/sql-certification.aspx#fbid=-30rJSRheqE
If you have an MCITP: Database Administrator or MCITP: Database Developer certification, you can upgrade to the MCSE: Data Platform certification.
Step
Title
Required exam
Certification earned
1
Transition Your MCTS on SQL Server 2008 to MCSA: SQL Server 2012, Part 1
457
2
Transition Your MCTS on SQL Server 2008 to MCSA: SQL Server 2012, Part 2
458
3
Transition Your MCITP on SQL Server 2008 to MCSE: Data Platform
459