It looks like a nearly whole build of Android 4.3 recently leaked for the GT-N7100 Samsung Galaxy Note 2. The new build is version N7100XXUEMK4, and includes several new features like Samsung's KNOX security and compatibility with Samsung Galaxy Gear. It is remarkably stable so it should be one of the "final" builds of the device. Here's a quote with a breakdown of how to try it out below. (Of course, be cautious and follow the directions perfectly. We don't want you "bricking" your device.)

Model: GT-N7100
Country: India
Version: Android 4.3
Changelist: 2099172
Build date: Sun, 10 Nov 2013 14:55:01 +0000
Product Code: INU
PDA: N7100XXUEMK4
CSC: N7100ODDEMK1
MODEM: N7100DDEMJ9
Download: N7100XXUEMK4_N7100ODDEMK1_N7100DDEMJ9_INU.zip

NOTE
- This test firmware will NOT increase your binary counter NOR void your warranty.
- This test firmware is a pre-release firmware and not official from Samsung.

INSTRUCTIONS
- Extract (unzip) the firmware file
- Download Odin3 v3.09 (From here or here)
- Extract Odin .ZIP file
- Open Odin3 v3.09
- Restart phone in download mode (Press and hold Home + Power + Volume down buttons)
- Connect phone and wait until you get a blue sign in Odin
- Add AP_N7100XXUEMK4_2099172_REV04_user_low_ship.tar.md 5 to AP
- Add BL_N7100XXUEMK4_2099172_REV04_user_low_ship.tar.md 5 to BL
- Add CP_N7100DDEMJ9_REV08_CL1423182.tar.md5 to CP
- Add CSC_ODD_N7100ODDEMK1_2099172_REV04_user_low_ship.t ar.md5 to CSC
- Make sure re-partition is NOT ticked
- Click start button, sit back and wait a few minutes.
- If you encounter any issues with the firmware (Any FC, Bootloop etc)
- Boot into recovery mode (Home+power+vol up)
- Choose to wipe/factory reset. (THIS WILL ERASE ALL OF YOUR DATA INCLUDING YOUR INTERNAL SD CARD!)
- Then choose reboot and you should be good to go!
Enjoy!

Source: SamMobile