Yep, Sony has released a new firmware update for the PlayStation 3. While these updates usually carry some extra features that aren't necessarily publicized, here's what the update contains according to PSN operations director Eric Lempel:
Hello, I just wanted to provide everyone with a head s up that the next PLAYSTATION 3 system software update (v.2.76) will be coming soon. This is a minor update that improves the playback quality of some PS3 format software.
There's a lot of noise on the US PlayStation boards mentioning problems downloading the firmware update, so if you can't download it via PSN, you may want top check here for some 2.76 mirrors.