Provided a set platform/software solution for community based ideas for new courses(community pitched ideas) , maybe you could run an annual competition where zwift users get to vote for the next course idea to be added to zwift.
Your best bet is to watch/listen to ZwiftCast or read ZwiftInsider for what is coming down the pipe.
Zwift is always working on a new expansion and they are also working on a new world right now.
Zwift uses its own design engine so it takes longer to design new extension and worlds.