I am reposting what I said elsewhere, because it answers your exact question. Bear in mind, this is what I want, and I think it would sell, but I could be totally off base:
Two things:
I'd like to see something apparently sort of like the Fantastic Locations: You'd get two double sided maps. 2 sheets of tokens, and a side trek or delve style adventure with some minor fluff/background/setting and 2-4 encounters. I would NOT expect great plot development in this product.
Then, for adventures, you've got the 64 or 96 page detailed booklet as a separate type of product. This would still include a map like they do now, but the story and setting would be far more detailed than the locations product or even therecent WotC adventures. The balance of the Maps are up to the DM: whether they be DTs, parallel FL Maps, or hand drawn. Likewise, the monster representation would be up to the DM, whether they come from minis, home made, or previously/parallel released with the FL product.
Both products serve a different purpose, but are linked, and I think they would fall at the same price point. One has higher dev costs, and one has higher production costs. You absolutely could use one without the other, but there is an 'ease of use' benefit to having both if the consumer so chooses.