This is interesting; if the 32CU Polaris 10 comes in 'under' 150w with performance similar to Hawaii/Grenada, and the PS4 Neo is rumored to have Polaris-based graphics, I'm wondering if it will have more than 16-20CUs.
PS4 Neo will have as many CUs as it needs to output a minimum 1080p 60fps. However many that is remains to be seen, but we'll have a much clearer picture of it after Polaris 10 benchmarks become prevalent.