SamMobile comes directly from a story that will make happy owners of the Galaxy Note first generation, which leaked the first so-called test leaked ROM with Android 4.1 on board Jelly Bean that Samsung is testing. We have no news yet on what is still not working in the ROM but definitely would not recommend using it daily if you find any bugs very heavy.
As regards the installation, is always proceeds in the same way via Odin, namely:
Find download the ROM with Android 4.1 Jelly Bean in the dedicated section of our forum accessible from the following link where you will find moderators and users who will help you if you need them.
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