Makes resources more sparse than base game. You will need to use trains much earlier to get resources. Game will be more difficult especially with higher enemy settings.
Tweaks
Mod category: Tweaks
Small changes concerning balance, gameplay, or graphics.
I'll be interested to see how much of Earendel's stuff makes it into the DLC. They hired him as a concept artist officially - which makes sense given his beautiful work on Alien Biomes - but they have also talked a lot in the past about expanding Factorio into space, and his Space Exploration seems like a decent intellectual property pick-up for them if he did in fact turn it over.
I'm waiting to see some official info. I had a go at SE and RSO when it was released but it got a bit complex - par tof work in RSO is actually done. There is still the most tricky part - how to do some special stuff that SE does on various areas and how to balance RSO on finite areas with varied configs.
A lot will depend on the what if's about dlc being some variant of SE or not :D