With the introduction of improved Prefabs, objects in the Hierarchy now have icons in order to convey information about Prefabs that would not otherwise be easy to see. Those of you who've been using the Preview Build knew this already, though the icons have a slightly new look in the beta. For others it may be news. The icons let you see: Whether a Prefab is a Prefab Variant, Model Prefab, or regular Prefab. Where Prefab roots are. Those are all the blue icons. Whether objects under a Prefab root are part of that Prefab or added as an override. As with many features, we've heard many different opinions about the icons. Here in the forums we had many people pitch in with opinions in the thread here. We have taken that feedback to heart and made the icons for GameObjects more subtle than they were in the Preview build (where they were the classic 3-colored GameObject icons). We still might not be able to make everyone happy, but if the prior feedback is anything to go by, the new icons should work well for most people.