I bought an unlocked S2 last year and I had too root and flash ICS on it, as the CSC was from Panama and highly unlikely would it see an update. Samsung had way too many CSC versions for the S2 and really made it confusing, which seems fixed now with the way they introduced the S3. With your phone unattached to any carrier there's no guarantee when you will see one, so I would at least check which CSC is on your phone and go from there.