Reverse engineering efforts have only stalled for ARM SoCs using PowerVR GPUs from Imagination Technologies. However for Qualcomm Adreno and Vivante GPUs, the freedreno and etnaviv projects are steadily and quietly moving forward; both have been integrated into mainline Mesa at this time.
For instance, I learned from HN last week that you can run android on i.MX6 with open source GPU drivers. This is a big deal. See: https://www.collabora.com/news-and-blog/blog/2017/04/27/andr...