Hey,
what I would like to see personally although it has not big potential:
- Stargate Universe - dark survival setting, roleplay, inventory, FPP+TPP+strategy view from the top(ala starcraft?), exploring Destiny and universe, aliens, space battles, FTL, ship's systems, integrated assets from the series(like music, cutscenes,...)
Alice in the Wonderland / Little Prince/???
- something different, questions and mostly/make your own/no answers, interesting gameplay and situations, roleplaying?, "path itself is more important than its end" - or whatever is the correct translation,...?
Something in the mood of the 4D game - Miegakure.
, what could be interesting by its background lore:
Avatar - yes, the blue guys with head tails from the movie. I guess it has a strong background story, detailed lore which can be expanded further, there can be multiple locations like the human station in space and their base on the planet, destroyed landscape, nature,... It could have some aspects of hippie, drama, states of mind, energy, living in the world, peace, freedom,...
Maybe in somewhat same mood like Lara Croft games.
, yet another AAA (medieval?) RPG (by YET I mean that it should be something completely new and interesting enough to differ from witcher, cyberpunk and other games/movies,.. )
- here I guess that strong background material is needed for players to hype themselves(like books in case of CP), or something completely new, but with enough personality to be well understood.
Something in a mood of AC 1-(insert the latest sequel number you liked), Gothic, Skyrim, Witcher 2/3, Heroes of might and magic 3, Warcraft 3,...
Edit - while I am at it:
Actually, it could be super nice to do some historical reconstruction - like king Arthur and the knights of the round table.
The game could be "altered" to include magic, but the characters and background are rich nevertheless.
Hope to didn't spam you much,
Peace