I spoke with a computer scientist a few weeks who told me that in computer science there is something called a "vision paper", which is a paper that does not contain concrete results, but rather outlines a more general vision of what one either wants to do, or how a field may develop etc. A future vision in any case is presented.
Searching the internet "vision paper" for computer science actually did not return many results - lest so for mathematics.

But maybe there do exist such journal that offer a home for such articles in mathematics and it just happened that I didn't find that. If you know of any, please let me know.