Finally! The Skyrim 1.4 patch has come out today for the xbox 360. I don't know if it has been released worldwide, but it has been released for the xbox 360 in The Netherlands.
If your game doesn't update right now, I'm sure it'll come later today.
Now stop reading this blog post and go enjoy completing that Blood on the Ice quest and finishing your Thieves Guild questline! (like me ^^).
If you want to see what it all fixes, check the page Patches (Skyrim).
Update:To prevent people keep asking this question: yes this patch is also released for the PS3.
And well, this patch didn't screw anything up for me, i guess i'm lucky (looking at the comments). Blood on the Ice started normal and i don't have extra game freezes or lag.