New firmware update 1.90 out in Japan! US and Europe to follow

Here's a list of what's new:

• Option menu now includes "eject disc"
• Press triangle on the XMB to eject the disc
• XMB backgrounds
• Change the folder classification
• Emoticons
  
• Change CD output to 44.1/88.2/176.4kHz
• Force 24Hz output for Blu-ray over HDMI
• Change PS3 video settings in-game
• "Bit Mapping" in the "Music Setting"
• Save AVCHD type animations from a Memory Stick
• Change settings like upscaling while playing PS and PS2 games
• Add bookmarks
• Web browser security function in the browser's tool section
• Avatar moves during audio visual chat
• Ability to rearrange games on the XMB

As far as I can tell, still no custom soundtracks, although there's some cool updates like the ability to set custom XMB backgrounds.