the updates are rolled out in batches, if its not available via OTA the you could try updating through Samsung Kies software. it that is still not available then, best thing is to wait for the update to show up.
Give me some MB's http://db.tt/IzxPvtOl
Samsung Galaxy Ace GT-5830 Running Stock Ginger Bread 2.3.6
Samsung Galaxy Tab 2 GT-P3100 Running Stock Jelly Bean 4.1
Samsung galaxy S3 GT-I9300 Running Stock Jelly Bean 4.1.2