I'm happy that you enjoyed the demo! : )
There was some extra lore per monster type and items that you can read in the Easter Demo (last year Easter).
You could collect easter eggs and every egg comes with a 3D model that you can check in and "extras" tab in the main menu.
This feature will probably return in the full game : )
You can see some of the models and descriptions in the video below.
The person who made this video didn't press "Action" when the model was selected to see it in full screen and control the camera around it.