Samsung has just started to roll-out Android 4.1.2 Jelly Bean update for Galaxy Note II GT-N7100 December 11. Lots of Features was added and bug fixes for Galaxy Note II device.
You can update your Galaxy Note II through Samsung KIES or by using OTA.
Poland (Play) PRT - December 11
Note: You cannot update your Galaxy Note II to Android 4.1.2 Jelly Bean right away. Check if the update is available in your Country or Network Provider in this link: Link 1 Link 2