I certainly hope there is something more than the things found in the clouds in beta because that means we've seen it all already otherwise.
...Hopefully there will be some more extinct civilistations out there to find and maybe some non-extinct ones.
On the exploration front I'd imagine that there will be quite a bit to find that has been in the game for a while yet. But I'm doubtful that there will be large elements of new content that wasn't tested in beta. That after all is what beta so to do. It's testing not early access.
They did release the Thargoid Surface Sites without prior beta testing.
Yeah they have done releases without beta testing I agree, but I don't recall any of them being large, new gameplay elements, only ever variants of existing elements.
I'm not trying to rain on anyone's parade here, just trying to be sensible and calm.