Layout Builder Clone looks to enhance the Layout Builder UI for cloning layouts, sections and blocks.
Layouts (WIP - TBD)
Layout cloning will allow you to directly copy the layout from other existing entities.
Sections (WIP)
Section cloning will allow you to duplicate sections on a layout, or clone sections from other entity layouts to the current.
Blocks
Block cloning allows you to duplicate blocks within the same layout, copy/move inline blocks to your block library, or copy block library blocks down to inline blocks.