Richard Huddy, Gaming Scientist for AMD, announced at a presentation last week at PDXLAN that plans are still in motion for releasing a public Mantle SDK this year. Intel and Nvidia have been publicly encouraged by AMD to use the SDK for free.
The SDK release would enable hardware developers to write and release drivers with Mantle support, working on a low graphics core GPU-level to increase overall gaming performance.
So far, 20 games have launched or are currently in development supporting Mantle. Four game engines and 10 game studios have embraced the API as well.
The offering of a public SDK from AMD to it's competitors is significant. Collaboration to bring forward industry change could help increase gaming experiences for users in a large scale.