My interpretation of what the patch is about is "stability issues." Bug fixes (by this I'm assuming they mean
quest bugs) are not the priority for this patch.
http://www.gamesas.com/index.php?/topic/1179411-an-update-from-bethesda/
So what’s in that patch? First and foremost, optimizations and stability improvements. While there are bug fixes, our core focus was on improving stability and performance.