This list of leaks I came across has me very worried.
Differences between what they've said and shown in trailers, and what has been seen so far:
90/10 life rule. So far 100% of the planets have life.
No real ship classes.
No "weirder planets and creatures closer to the center"
Community working together to discover crafting recipes. Everything now has a blueprint.
No "Epic space battles" Space is rather empty most of the time.
No Element combination.
Portals. No one seen them (perhaps yet)
No ringed planets.
No barren planets.
No leaving messages for players.
No ship naming.
No AI wingmen.
No animals walking in herds, they all walk rather random.
Cloaking devices are missing.
Lack of mountain-sized mountains.
Harvesting resources from stars, you can't even get close enough to them.
No Day/night cycles being caused by planetary rotation and planets don't seem to be lit by the sun at all or even orbit.
No creature food chains.
None of those ship formations flying overhead on planet surface either, actually the business you see in the trailers is totally absent.
No sign of creatures affecting trees and fauna (like the rhino in second trailer)
Blasting holes in asteroids, so far I've only seen them blow up.
You cannot see as far as the curvature of that planet.
The universe is absent. it seems to be a chain of galaxies you move through and as far as we know now, once you leave a galaxy for the next one, you cannot return. That's not really an infinite universe at all.
No landing on asteroids.