i'ts PSN maintenance, so it could really only be about two or three things they are donig.
1, another security vulnerability was discovered and they are quietly patching it.
2, there are some really extensive changes to the XMB or features within it.
3, background coding changes that needed to be done to support different hardware infastructure (servers etc.)
either way, I suppose it's more good than bad. It just sucks when it interferes with what we have planned...