Firmware 1.92 (PS3) Out now.
Apparent changes show that the ability to add Flash wallpapers has been added.
Controllers auto-power-off now.
Miniclips (thumbnails) in the videos section, and game clips in the games folder all load up synchronized now. Quitting from game into XMB transitions quicker.(Aesthetic/Efficiency Update)
http://www.n4g.com/ps3/News-65091.aspx
Confirmed: PS1/PS2 Compatibility updated.
Still awaiting official changelog from Sony.