A developer over at XDA forums – eybee1970 - has managed to get his hands on a half-baked Android 4.1.1 Jelly Bean firmware for the original Galaxy Note. The firmware is in very early stages of development, and is not really usable as a daily driver.
The leaked Jelly Bean firmware confirms that Samsung will be bringing some of the software features of the Galaxy S3 and Galaxy Note 2 to the original Note. While the multi-window multi-tasking won’t be coming to the Note, Samsung will be bringing all the sensor based gestures from the S3/Note 2 to it.
As stated, the firmware is in very early stages of development and has a lot of bugs. It is not even available in a CWM flashable zip format, and the installation steps are pretty complex as well.
If you are willing to put the life of your Galaxy Note on risk for some Jelly Bean goodness, head over to this XDA thread and start searching for the download link and installation instructions.
Samsung will be rolling out the official Jelly Bean firmware update for the Note before the end of this year.