will scene editor have 3d skybox

Once hammer is officially phased out, will we still be able to do 3d skyboxes?

Wouldn't this be possible already with prefabs?

Isn't the eventual plan to not have 3D skyboxes? Like you have a Skybox for clouds etc. - but if you want 3D stuff like buildings and all that it literally goes into the scene because you're not limited to Hammer limits? Is there something special 3D skyboxes do that you can't currently do in-scene?