Interesting ideas @stealthtrader. I like many of them and while I don't know how hard it will be to develop such a project, it would be cool.

Adding to your idea of you ferrying people on your gold dragon, I am hoping that they create extra value for each card in the current game by having them do such tasks... So while dragons might be able to give flight and thus move people/things quickly (giving say addition bonus in that capacity), then other cards might be able to add in some way too (like the sneeks can take from opposing land and get you bonus points)... Or Ogres and Orcs might give you higher production of materials. And magic monsters can use their spells to increase value of say coal to convert to diamonds. Lots of potential and very complicated for sure, but mapping each existing individual card to be able to contribute in the expansion would be really really cool... and of course add value and depth in the process!