I love the streamlined play in Sorcerer King and the crafting system, though it can easily make you incredibly OP with a little thought. What I do not like and miss greatly from Fallen Enchantress is the lack of depth in the city system and the fact that you can only play the one race.
I would love to have the advantages of the new item system, coupled with the robust research tree (or a version of it) from FE as well as, most especially, FE city depth. The fact that cities specialize (enclave, town, fortress, each making use of your research choices differently) lent a real complexity and satisfaction to the planning of your infrastructure in FE).
I do not see why they could not keep both. The tactical versatility and pace of SK with the strategic depth of FE. Now that would be a game with incredible replay value.
Last balance thing... anyone playing this a few times will quickly realize that the ranger character is head and shoulders more powerful and useful than any two other heroes combined. Quickfire, used well, with a group stuffed with well developed archers trained in a heavily enchanted town, will destroy all but the most powerful groups outright. Add to that the Falcon skill: the ultimate scout who can can equipped heavily without fear as it is immortal as a hero and can wander the entire map scooping up mats like there is no tomorrow. It would be nice to have a compelling reason to start with another hero without feeling like you are artificially selecting another level of difficulty by passing him up.