I'll start with the already-known basics and go from there. You may very well know much of this, and I apologize if I'm stating obvious things, but, better safe than sorry.
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Two rides. There may not be very obvious attraction signage, so don't miss either!
Na'vi River Journey is a short boat ride.
Flight of Passage is a simulator. More intense than Soarin', but not that that should scare you away, unless you have back problems, are pregnant, etc.
Places of food/drink:
Satu'li Canteen is a quick-service place. It will employ a new thing, mobile ordering.
Pongu Pongu is a quick-service beverage stand. It'll sell refreshments, some of which are quite unique.
Joe Rohde has said that there's one spot in Pandora where magic bands will be used in a very "intimate" way. Don't know where it is or what it entails, but you might want to check it out!
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I'll edit this if I know anything else of value... or not of value.