The upcoming software update for the PS3 includes the revamped PLAYSTATION Store
and will also add add DTS-HD Master Audio output for Blu-ray videos.
This means that the high-definition visuals of Blu-ray will now be matched with the highest quality audio.
DTS-HD Master Audio is literally bit-for-bit identical to the studio master recording and makes movie soundtracks and sound effects truly come to life. The technology delivers audio at a high rate of 24.5Mbps on Blu-ray disc, which is significantly higher than standard DVDs. DTS-HD Master Audio also offers 7.1 audio channels at 96k sampling frequency/24 bit depths. The firmware update will add DTS-HD High Resolution Audio as well, which is a similar output technology that requires less disc space. You can read more about both codecs here
The firmware will be available in the following days.