I hope more announcements are forthcoming that announce which development studios have signed up. 
Source
http://semiaccurate.com/2014/05/01/amd-begins-private-mantle-sdk-beta/
Full Article
http://www.pcworld.com/article/2150...velopment-studios-for-private-mantle-sdk.html

Today AMD is launching a beta program for its Mantle API software development kit. Mantle is a graphics API that was created in a collaborative effort between AMD and game developers to build a lower level graphics API than what competing solutions like OpenGL and DirectX offer. Mantle has so far been implemented in two publicly released games, Battlefield 4 and Thief. Our initial impressions of Mantle have been positive, but using the Mantle rendering option in these games has been a bit of a gamble due to various bugs and teething issues. Additionally Microsoft announced at this year’s GDC that the upcoming DirectX 12 API would be very similar to Mantle in its current form.
That said there is still a lot of interest in Mantle from game developers and gamers alike. Gamers see it as a way to get a free performance boost from their AMD-based GPUs and developers see it as a way to prepare themselves for coding DirectX 12 applications. AMD still has yet to release Mantle as a publicly available graphics API and for now Mantle is still locked to only AMD’s hardware. But the launch of this Mantle SDK beta will go a long towards reaching both of those goals as AMD has finally decided that the Mantle API offers, “all necessary stability, performance and functionality milestones required to ready it for a broader audience in the developer community.”
Speaking of developer support AMD is opening the beta by announcing that forty different developers pre-registered for this beta and that they are now inviting everyone else to apply into the beta. AMD isn’t requiring a whole lot from beta participants, by they are asking beta applications to have prior development experience which is a no-brainer from our perspective.
The core of the Mantle API is officially finished from AMD’s perspective. Now it’s up to developers and AMD’s developer relations team to take Mantle to the next level with new coding techniques and wider support for the API. Mantle has been an interesting story to watch so far, and with this public beta the story of Mantle is beginning a major crescendo.
Source
http://semiaccurate.com/2014/05/01/amd-begins-private-mantle-sdk-beta/
AMD said Thursday that the company has signed up 40 developer studios wishing to use its Mantle technology, and is issuing another round of invitations for others to access a new portal.
AMD wouldn’t say who those developers were, or whether the company had extracted firm commitments from those who had signed up to develop for AMD’s technology. But the company is trying to generate buzz surrounding the sheer numbers of those who have signed up.
“There are no objective criteria for being selected, as we are interested in talking to developers of all shapes and sizes,” the company said in a statement. “Past development experience is encouraged, however.” The password-protected developer portal is now live
Full Article
http://www.pcworld.com/article/2150...velopment-studios-for-private-mantle-sdk.html
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