I think due to having movie and book rights the possibility of these minor referenced characters is very high.
We already know of Radagast and Elrond's sons but do you think we'll meet Thranduil in Mirkwood? Possibly meet Beorn on the way there?
Also if any what legendary weapons could we find? Gandalf found Glamdring in a troll's treasure hoard so might we see The Dragon Helm or Dor Lomin, Aeglas or even Gurthang?
What do you hope to see?
Above all else I hope to Illuvatar that Tom Bombadil makes and appearance because he was a sore exclusion from the films for me.