A few people have asked about the changes made in MDT 2012 and MDT 2012 Update 1 in regards to the MDT database. There aren’t that many changes, but here they are:
If you have an existing database, no properties will be removed; the properties marked as “removed” above just don’t get created in new databases.
If you have an existing database, the properties marked as “added” above will automatically be added to your existing database.
Any customizations that you might have made to your database should be preserved.