I know pack 6 is a while away; however I don't know how far ahead of releases the design work is.
My suggestion is that for the second half of the dwarrowdwelf cycle the dwarven treasure cards (random cards from the encounter deck) get turned into treasure cards. I always felt they should have been incorporated into the adventure in an ongoing way.
I believe they would have been if this set had come out after the hobbit saga.
I would like them to be kept as random reveal treasures although I would like subsequent adventures in the cycle to include a set-up rule saying you can start with those cards in play if you earned them in a previous adventure in the cycle.
Obviously I would also like the difficulty of the nightmare modes to be made even harder to account for this bonus.
In a similar vein I hope to see "campaign mode" boons and burdens for each cycle to be made in future because I really do think campaign mode is the future of the game - they would really help to build up the story telling potential which seems to already be ramping up quite a lot with each new release.