Assuming AVX-512 actually works well (haven't had the opportunity to use it myself), it could be very useful in high-end gamedev. Data-oriented programming is popular there, which makes it much easier to optimize data transformations w/ SIMD. Good compilers can even do some auto-vectorization (it's a nice boost with no additional programmer effort but you can't rely on it much). GPUs tend to be already fully loaded by the intensive rendering workload, so there is a large incentive to squeeze as much as you can out of the CPU.
