Posted this on the Atari thread:
-New graphics engine. Go all out. DirectX 11, scales up/down by 2+ years, whatever. Get good driver support. Make it look as good as possible while still running well on most consumer computers made in the last 2 years.
-Official support for custom scenery. Make an official file extension, import/convert from popular 3D modeling programs. Bake custom scenery into the park file, or just have a unified extension for all content.
-Social/Multiplayer. Make it easy to share parks/designs/scenery. Make some sort of substantial competitive mode, doesn't have to be in real time.
-Compatibility. Break all of it. I mean it. Start fresh, don't worry about working with previous games or files-dedicate everything to making this game work well.
-Expansions. I might not be alone when I say that if expansions were basically glorified patches, I'd gladly pay $50-60 for the game up front.
-Cloud support. Back up park files to a server. It's not like we're backing up entire movie libraries here. Would make the "hard drive crashed lost park sorry guys" post occur less often.