I was just reading through an old news post about the Black Riders [http://www.fantasyflightgames.com/edge_news.asp?eidn=4209] and there is a little line in there which hints that we might be getting some more treasure cards in the future...
"We decided, for now, to let Treasure cards remain a special feature of The Hobbit boxes and come up with something new for The Lord of the Rings" (that bit that says "for now")
I didnt mind the way they did the treasures in the hobbit boxes, but i always thought it was a bit of a shame that you couldnt use them on more quests. If you went to all that trouble of winning them, then you want to get some use out of them.
And now I'm thinking that this new barrow downs quest they've mentioned is a great place for them to give us some treasures. Im a bit rusty with the books, but didnt they pick up all their weapons in the barrow downs?
That would be great place for some treasure cards because its still very early in the saga, and they will be worth winning because we can still use them for tonnes of quests
The other obvious place for treasures is lothlorien, where they get given some presents by galadriel. That will be early enough in the saga to get some use out of them as well.
I think the treasures cards could work quite well in the saga, much better than they did in the hobbit boxes, because the campaign is so much longer