So if I have this right, the 5 expansions of Talisman are: The Dungeon, Timescape, The Mountains, The City and a dragon-themed expansion.
How about changing the Timescape expansion to something involving an ocean/beach/island setting? I think this would better keep with the archetypal fantasy setting that all the Talisman expansions, except Timescape, share while at the same time providing a new setting not seen before.
I mean who does not want to fight giant crabs, sea monsters and evil pirates? You could have an albetros follower that makes all your rolls in combat "1" unless you pay a fate token to roll as normal. Maybe you could gain a seahorse or hippocampus follower that allows faster water movement, hire ships and visit a fishing village with similar rolling mechanisms like the City/Tavern/Village.
Thoughts or am I just totally off base?