Samsung had already release their ICS updates on GS II. The OS updates is available through Samsung Kies.
The updates are first available in different regions and countries. The following firmwares are:
XEO = Poland I9100XXLPQ/I9100OXALPQ (Android 4.0.3)
NEE = Nordic coutries I9100XXLPQ/I9100OXXLPD (Android 4.0.3)
SEB = Lithuania I9100XXLPQ/I9100OXXLPD (Android 4.0.3)
SEB = Lithuania I9100XXLPQ/I9100OXXLPD (Android 4.0.3)
Source: Samsung Buzz