are they a part of something bigger to come? 
I think it’s just a way to give people a better sandbox to work with. I’ve seen a lot of custom modes that try to do fancy stuff in “out of bounds” regions of the main maps because the terrain tends to be more interesting for things that aren’t the core game modes.
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That’s my assumption as well. I haven’t seen the maps first-hand yet, but based on the names, they’re probably generic arenas with walls/cliffs to use for Workshop modes that want simple terrain instead of complicated maps.
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