Update: The official changelog is now detailed at Sony's site linked above, with 2.20 changes including:
- Playlists that were created in Music and Photo can now be copied along with the content they contain to a PSP system. You can play the content on the PSP system in the order that was set on the PS3 system.
- BD Profile 2.0 is now supported. With BDs that support BD-LIVE, you can access internet content for the BD.
- Resume play* can now be used on a BD or DVD even if the PS3 system has been turned off or the disc has been ejected. However, there are some discs on which resume play cannot be used.
- DivX content that exceeds 2 GB can now be played. Also, subtitles can now be displayed for DivX content.
Currently via Network Update (or linked below), those interested can grab PS3 Firmware Update v2.20 hot off the press!
We'll post an official changelog when it's available, but for the most part 2.20 changes are detailed in the Press Release from earlier today.
To recap, notable features in the update include support for BD-Live capable movie titles, an optimized Internet browser that can now steam video files directly from Web pages, and support for DivX and WMV format videos larger than 2GB in size.