Hate to say it, but it may be a while. It was just middle of last year when they started the search for a new story writer. I'm not even sure if they've put keyboard to code yet. I think Below Zero took 2-3 years, so it may not be until the end of 2024/start of 2025 before we get any previews
I actually just replayed the OG Subnatica, it was fun, I'd forgotten just enough to make for a good play through
The only thing that bugged me was the dang Degasi bases on the island. I've put a lot of hours into Subnautica, and for all that time I still get lost trying to get to all three bases.
One cool thing to try, is putting two of the new large rectangular pieces side-by-side length wise (no connectors, just attached them) - it probably works if you try attaching them by the short ends, but it's not as cool as the long ends attached to each other