Well the update is live and ready for everyone to download, not to much was added, for the most part it seems strictly a flash based update.
Hi everyone, in the next PS3 firmware update (v2.53), coming soon, we’re improving the way the Flash Player works with the internet browser. In addition to being able to access more sites using Flash, you’ll be able to enjoy:
Full-screen mode playability
Live movie (using RTMP format) playability
Now it’s going to be even easier to enjoy web content on your PS3, in full-screen!