I've played a lot since the update and nothing has broken so far, at least for things that I have done.
The patch notes for the update are enormous. I think it ran to five or six messages in the forum. Most of it seemed to be a huge rework of Battlegrounds and PvP. although there's a lot of traffic from changing focus effects from being an item attribute to being a player attribute.
I don't raid and I don't do PvP, so anything there would go right by me.
One note: The zone name text no longer fits the button in the house exit window. I noticed this leaving Therendil's house in what is now 'Qeynos Capitol District.'
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