Just last week, Samsung started to roll out Android 4.1.2 Jelly Bean update to the Galaxy Note GT-N7000 and now have even released its kernel source code (This was quick!).
The Jelly bean kernel source will allow ROM developers to improve their custom ROMs for the Galaxy Note GT-N7000.
You can download the source codes here at opensource.samsung.com GT-N7000 (Galaxy Note)