Considering that CUDA is a
proprietary technology from Nvidia, how could they?
There are a bunch of CUDA translation shims being worked on.
Not holding my breath, it's been almost 5 years without a working CUDA shim. Hopefully this will push that work over the edge though. If I had the relevant skills I'd contribute...
I think they want everyone to move to Metal Performance Shaders. I've done some stuff on them, but not nearly as developed as CUDA.