Interesting post here that suggests i.MX6 might be nearing the end of the tunnel as far as the GPU being an unuseable black box is concerned
https://plus.google.com/105928421692264581950/posts/2U7o9agHZ8z
So with mali on the Allwinner devices and now entaviv for i.MX6 beginning to become useful there's a lot to look forward to in the next year for SBC's.