Don't get me wrong. Fix it fast and fix it often is a good motto to have when addressing software bugs. However, trying to decode what was changed between versions isn't so easy. Especially with products like Microsoft Sharepoint.
Sharepoint has had umpteen patches since Service Pack 1. Each one is outlined in separate KB articles by install file. This works out to about 100 tabs open in the browser to figure out what is in each cumulative update.
Is there not a database that has this stuff?
On another note, SQL 2012 SP1 is released, which doesn't include the fixes contained in CU3 & CU4, so download SQL 2012 SP1 and SQL 2012 SP1 CU1.