When you set render quality to Ultra you will see textures in your off-screen reflections. Previously, the surfaces were uniformly colored.
Outlines no longer scale with your resolution. This means that with a higher resolution, the outlines will be thicker in terms of pixels.
Also you won't see outlines around grass and vegetation objects anymore.
Tags in AssetLibrary
You can use tags to find the asset you are looking for much faster.
Once you enable this setting the first command to render an image activates the safeframe and the second command actually starts rendering.
Shadow / Highlight Slider
Similar to Photoshop, you can now tune the tonemapping via two sliders to add or remove brightness at certain regions.