It's deja vu time. Another firmware update which seemingly does nothing. Firmware 2.80 has, according to PlayStation Network's Eric Lempel, a single feature.
"The playback quality of some PLAYSTATION 3 format software has been improved." Of course, it's bound to do something, so the first person to download and discover the trophy improvements / added video codec compatibilities / kitten spawner* wins a cookie. Should be out within the next 24 hours (posted yesterday 23rd), if other releases are anything to go by.
*Please note, 2.80 may very well not include any of these things. We just don't know.
above statement copied and pasted