The features that will make Nougat worthwhile for the Note are:
1. Much better Doze/standby battery life.
2. Larger screens in app switching.
3. Double tap the app switching button to switch between the 2 most recent apps.
So nothing huge, but it will be good if they don't botch it up. Last year when the Note 5 came out, Samsung promised Marshmallow within 3 months of its release. The earliest US provider to release it was T-Mobile, and I believe that was 6 months after release. So I wouldn't expect anything before the S8 ships, or around mid-March 2017.
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