According to Wardell, Sony’s current API is much low level compared to Mantle and even Vulkan but they should look into adding Vulkan support for the console as it will reduce a lot of developer overhead for cross platform development.
“What I was referencing at the time was Vulkan. We’re part of the Khronos Group and now it depends who you talk to at Sony and this gets in to a debate. Sony has a very low-level API already for the PlayStation 4. The problem I have with it is that if you want to make use for it you’re writing some very specific code just for the PlayStation 4. And in the real world people don’t do that right. I write code generally to be as cross-platform as I can.”