PS2 Ninja updates

PS2 has been implementing un-announced patches, being the last 314mb big. Anyone knows which changes were done? Any new security measures?

Its probably just bug fixes and stuff, if it was something important they would most likely announce it.

I found what's up with this 400MB update in the assets files:
They already included some of the Hossin map content in the client.

What they are trying to do is instead of making one big 1GB update, making two 400MB updates.

I don't know if it's really worth it, but well that is what they did...