Hello...of course we know the next big Talisman expansion will be great, no matter where the board is placed (if there's a board!)
But it's fun to speculate.
Besides, it's an interesting question. The corners and center are all full now! And the full board is indeed pretty big. So what would you do? Here are a few ideas...
New Inner Region: The Dragon technically doesn't need its board (pg. 3); it's optional. So if you put a new Inner Region down, you could still use The Dragon with it.
Off to the side: If Timescape were to be redone, I guess it would go here. The playing area would just be too big, I think!
Somewhere else? Any other speculations? Where else could a board go?