Revised DRI3 v1.1 Modifiers Support For Mesa
This work by Collabora has been the first significant update to DRI3 proposed. The X.Org Server bits have yet to be merged but good progress is being made. The DRI3 v1.1 work is primarily about modifiers and multi-plane support, which is primary being fitted for SoC use-cases.
With Daniel's patches, the modifiers support for Vulkan in Mesa has been completely re-implemented and working on both X11 and Wayland. More details on these patches via Mesa-dev.