About 10 years ago, there was a project to think of ideas fo the R2 release of Haiku. It was called:
There’s some pretty cool stuff in there, at least from a GUI development perspective.
It goes into all areas of the development, including the kernel, data translation, network, storage, and ui, amongst others.
I’ve made a few comments in there on the following topics so far:
(I’ll probably duplicate these to the Creative Design Forum as well unless anybody else thinks otherwise.)