Some speculate that KQ7 might take place between KQ4 and KQ6.
I definitely want a new land, but starting with some exploration of Daventry would be good, too
Starting or ending up in an area in Daventry is always a good idea... It worked in KQ3 and KQ8. Most games started in Daventry in some fashion.
One possiblity is Graham is visiting another land at the start of the game, or has been captured by an army and taken to another land. His kingdom invaded. In both cases he has to solve puzzles in the new land, and work his way back to Daventry to save it!
I'm not sure I want a game that is fully set in Daventry again... We had that back in KQ1. I want to explore new areas of the world, new kingdoms... As long as I get a bit of both some Daventry, and primarily a new kingdom. That would be cool.