Neither did I. I also had no idea what "" was until I looked it up. Actually I knew what it was, I just called it something else. You'd know it as "fuzz" around the edges of objects in a compressed video or picture. It's technically a subset of the sort of general artifact degradation that can occur when complex data gets dropped or misplaced during an aggressive compression process. The update adds a feature to reduce it on videos saved to the hard disk or played from other media.
Wait. Stop. Back up. What I meant to say, was the last update (v2.52) added all that stuff. Seems about what's new and what isn't. In the v2.53 update, due out Wednesday, the only change is apparently this one:
An update to the PS3™ system software was released on November 26, 2008. You can use this update to upgrade your system software to version 2.53.
New for 2.53: The Internet browser now supports full-screen mode for Adobe® Flash® Player content.
Support for Adobe® Flash® Player 9 has been added to [Internet Browser].