I think this DX12 announcement is more a response to AMD's Mantle API.
Not that I am an expert when it comes to API's but the PS4 Open GL is specific to it's hardware already (as is the X1 as well to some degree) and apparently there is a lower level API to bypass a lot of it. From some article I spotted at Eurogamer:
"One of them is the absolute low-level API, you're talking directly to the hardware. It's used to draw the static RAM buffers and feed them directly to the GPU," Norden shared. "It's much, much lower level than you're used to with DirectX or OpenGL but it's not quite at the driver level. It's very similar if you've programmed PS3 or PS Vita, very similar to those graphics libraries."
But on top of that Sony is also providing what it terms a "wrapper API" that more closely resembles the standard PC rendering APIs.
"The key is that it doesn't sacrifice the efficiency of the low-level API. It's actually a wrapper on top of the low-level API that does a lot of the mundane tasks that you don't want to have to do over and over."
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