As usual Japan always gets the good stuff first, lol. Here is what the update includes:
* Games on the XMB can now be sorted
* Customization options for the wallpaper in the cross media bar (XMB) and fonts
* Inclusion of “eject disk” on the [...]
"PS3 FW 1.90 Hits Japan, the rest of the world tomorrow" - 23.07.07