euuh man, normally any "not branded" (not AT&T, orange, ect...) SII got the official release.
Check out this topic:
http://www.lebgeeks.com/forums/viewtopic.php?id=11862
this should answer your question, and if you want to manualy check for an updante:
1) click on menu
2) click on settings
3) scroll all the way down to "about phone" (last line)
4) click on software update
5) click on "check now"