ICS 4.0.4 千呼萬喚此出來 >_<,  both ICS 4.0.4 & 4.0.3 are rely on API level 15. ICS 4.0.4 is a further enhancement (bug fix) on the 4.0.4. It only have the following bug fixes.

• Noticeably Faster
• Android OS bug fixed (in battery stats)
• Long-pressing on a blank spot on the last page of app tray bug is gone
• New Radios. 3G/4G switching MUCH better. Don't even notice it changing.
• Improved signal strength
• New Power Menu. New from 4.0.2, familiar to those who have used a stock 4.0.3 rom.
• PRIMELA03 Bootloader
• Faster boot up time
• Auto-brightness Functionality changed. Smooth transition
• Holding down camera button now refocuses again
• Multitouch issue seems resolved.
• Autorotate is faster
• Browser performance noticeably improved
• Recent apps list opens faster
• Miscellaneous camera UI changes
• Increased volume
• Keyboard fixes
• Updated News & Weather app UI
• Improved quick controls in browser.