@areankim
Changes i notice:
PROS:
1. Battery life. it's not 30% increase

IMHO, it's 80% or even 100%

under heavy usage, i notice a lot of improvement. one last bar of battery can last whole night from 11+pm, till 7+am. from 7+am, i played music via headphone and online via WiFi for 45mins till battery dead

2. New music player. 4 or 5 different scroll speed, little GUI improvement, new visualization
3. Extremely FAST bootup. mine average 18.3sec from OFF to Nokia Hand Animation (can be skipped, like usual)
4. More RAM. initially 30.3MB but after used for a while, dropped to 25-26MB. still good IMHO
5. Hissing background sound in music significantly reduced, at least on my unit.

6. Search 4.0 preinstalled. actually it's a powerful software. once u know how to use it, it's very convenient
7. Video ringtone enabled
8. No more keypress bug
9. When slide to multimedia key, no more Multimedia Menu pop up

10. Camera startup very fast. average 2.3sec on my unit. shoot to shoot time faster too. Picture quality IMHO still same, albeit softer (less sharpening and noise)
CONS:
1. New menu layout not to my taste. i hate subfolders...
2. In music player, u cant add songs in Recently Added playlist to ur playlist. crap.
3. damn camera focus lock and shutter sound still cant be turned off

4. some bugs with wallpaper
5. N-Gage waste of memory space and time...
6. USB speed still slow as usual. hardware limitation?