At last week's Linaro Connect Europe 2013 conference, there was a presentation regarding bringing Android's HWComposer on Linux KMS.
Ross Oldfield of Broadcom talked about using Android's HWComposer with Linux kernel mode-setting. The focus of this work is on having a common display back-end for both Linux and Android by bringing together a common Android display HAL for multiple SoCs and that KMS should be a good fit since it's widely used after all on the Linux desktop and is being used by more ARM SoC graphics drivers too.
For developers it would mean not having to make any special changes to go from supporting a display on a Linux system to then on an Android one. Anyhow, as this is a rather niche topic, if you're interested see the PDF slides
or watch the embedded video below.