It seems that the PR1.2 SDK has been put up, so you can expect what you'll get in the next n900's firmware ^^

1- Virtual keyboard has been redone.

2- Menu is now rearrangable, and there is no more "More..."  


3- Clear device is back in Settings.  


4- The gap in the menus and status bar have been removed (top gap) - Edit: Might be SDK specific since the status bar isn't exactly the same as on the device.  


5- Browser now has a back button, history view is accessible using the gesture.  


6- Enable rotation is now an option in Settings (Browser).  


7- Volume buttons can be set to change volume only in browser.  


8- User Guide accessible in the browser from a main menu shortcut.  


9- Media player has a play button icon instead of the moving bars (bottom right area)  


10- Ovi Store link in "Change background" and "Themes" area.  


11- Browser seems much much snappier, scrolling is quick and rendering is uber quick! Not sure if this is related to the much faster processor but the gecko engine was updated.

12- File manager has a share option for all files.  


13- Video call option can now be enabled in contacts, SMSs to landlines can be disabled, voicemail number can be set.  


Stay tuned over this thread !