Confirmed: PS4 Pro does NOT support 4K Blu-ray
https://twitter.com/StuffTV/status/773609999381790720

No 4K Blu-ray in PS4 Pro is a *big* oversight. Disappointing.
https://twitter.com/VG_Dave/status/773612196169474048

おいマジかよ そりゃ箱公式も煽るわ(´・ω・`)