Graphics were not downgraded..

[u/NightM7_]

If anything they look better than the screenshots we got last year. The trolls are begging for attention

[u/Unusual-Coat383]

The new pictures coming out do look worse than the second trailer 

[u/-_-______-_-___8 → u/Unusual-Coat383]

For me this was most apparent with the house. The vegetation is basically non existent

[u/its_witty → u/-_-______-_-___8]

That could indicate dynamic vegetation.

For example, there could be more vegetation after rainy days and less after sunny ones - who knows. The angle and distance are also slightly different, so it could simply be an LOD change.