I would like to see them include elements to make the Valley of Chaos more of a strategic undertaking.
Connections and conflicts between tribes, multiple points of ingress, elements within the caves that will change the situation (such as "The Axe of the Orcish Lords"), etc.
They also need to deal with extended rests so that PCs don't just hit the first encounter and blow all their daily powers, then head back to town, then come back and hit the next room, repeat until the whole place is done. Dynamic encounters - where each one has the possibility to attract more - would work; that means also that stealth and diplomacy might work wonders.