I just tried the HDRI Preview feature. I did love the effect it had on the environment light, but using the HDRI I tried with (the one initially recommended by you at LL for PBR work) did cause a field to be drawn on the sky dome, which looks really funny and out of place... screenshot attached with a view from an unenclosed skybox. In my case, a simple sky-and-maybe-clouds texture there would probably be better. I'd love to see this feature evolve to where one is able to upload an EXR or HDR file and apply it to the environment. I'd also love to see the feature evolve such that... The light from the HDRI is kept but the rendering of the image on the dome can be disabled. This effect is possible to set in both Blender and Substance Painter for example, also an option to blur it. In conjunction with the above feature, combining the use of an HDRI and the animated cloud texture we already have today, and the clouds should of course cast shadows! This would be great especially when you have very small or no clouds in the HDRI texture when you choose to keep it rendered. I'd love to be able to have one HDRI above, and another one under sea surface. Combining this with the previous mentioned features could allow for really cool effects under water! The ability to set one HDRI for environment light, and a separate HDRI for "texturing" the dome. Setting this texture to a built-in Transparent texture (or a new one like that for HDRI) could be the mechanism to cause the first-mentioned feature of hiding the image of the HDRI on the dome, only keeping its light. Without the above few features, I wonder if this feature would end up only really being good when you're taking photos. Hope this makes some sort of sense... Thank you! =)