Seems that last week unintentional Samsung Ukraine timeframe post is accurate as their colleagues in Japan have begun rolling out today, February 4 Android JellyBean software upgrade to the GALAXY S II SC-02C model in the country.
The upgrade is available through Samsung Kies software. The new build after a succesful update should be build number IML74K.OMMP4. Customers living in Japan who own S2 phones bound to NTT Docomo can check for the upgrade, but first make sure you’ve got the latest Kies version.
The upgrade is also available for those who own Samsung GALAXY Tab 7 Plus SC-02D tablets, however the build number is different. For your device you should see build number IMM76D.OMMP4 after the upgrade is successfully installed.