You might already have upgraded to ICS 4.0.4 in any how but here with Samsung Kies, you can enjoy with the new upgrading to the latest Ice Cream Sandwich.

I just got today and now being test if they are fine with all apps:

Device name : GALAXY S2 (GT-I9100)
Service name : GT-I9100 Software Update
Service version : PDA:LPF / PHONE:LPB / CSC:LPF (THL)

You can do officially upgrade from Samsung Kies from now.

Features in this version

• TouchWiz UI run smoother,
• Improve the notification dropdown,
• Improve the lock ring circle animation,
• Create a contacts link button on the dialer,
• Remove local search,
• Improve browser notification,
• Improve camera and video playback, and
• Add battery percentage to the display setting