Looking at what materials we have for Pathfinder in hardcover, there is a great assortment covering a lot of aspects of the game. Now what I would like to see is a little more attention to Golarian in the hardcover lines. The Inner Sea Gods book for March looks like a great addition.
I think it is now time to bring out a Dragon Empires World Guide hardcover similar to the Inner Sea World Guide. As well as a Dragon Empires Map Folio (Yes I know its not a hardcover).
It would be very cool to see the other World Guides in development as well, escecially Casmaron.