The 1.90 Firmware update just hit Japanese PS3s. Let's dive in and see what the update entails:
• Ability to rearrange games on the XMB
• Option menu now includes "eject disk"
• Press triangle to eject games/CDs/movies in the XMB
• 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
The customized backgrounds and the emoticons are nice touches. Not a bad update, not a bad update at all. Hit the jump for a look at the emoticons.

Update: The US' Playstation Blog reports that firmware 1.90 will be available to download in the "next few days."

1.9 Drops [Game Watch via NeoGAF, Thanks Jason!]