SFR has just received the information: the Galaxy S 2 should receive pack (read: start receiving) the updated Android Ice Cream Sandwich on April 20 , in a few days.
Last March we publish a grip of this update on the bare terminals, by cons in this case (SFR), unclear whether the ROM will be exactly the same, you should find SFR few applications pre-installed, for example.
It should be visible in KIES that date, pull out your USB cables!