Proceeding the PS4 fMSX MSX / MSX2 / MSX2+ Emulator port, PS4 SNESStation SNES Emulator port, the PS4 CHIP 8 Emulator PoC and PS4GearSystem Emulator (Sega Game Gear / Master System) demo video today PlayStation 4 developer m0rph3us1987 announced on Twitter that Anonymous released ports via Pastebin of the Nintendo Entertainment System Emulator PS4NES based on LaiNES alongside PS4GearSystem which is based on the Gearsystem Sega Master System / Game Gear Emulator. 
Download: NES_EMU_V455.pkg (6.1 MB) / NES_EMU_V455.pkg (Mirror) / SEGA_EMU_V455.pkg (6.3 MB) / SEGA_EMU_V455.pkg (Mirror)
In the Tweets below, he mentions although they are native emulators not to expect too much stating that they are far far away from perfection.
How To Play NES & Sega Emulators On 4.05 & 4.55 PS4 by Andrew Marques
NES & SMS Emulators For PS4 by MasterTurkey
HOW TO Play NES and Master System Games on PS4
Download: NES_EMU_V455.pkg (6.1 MB) / NES_EMU_V455.pkg (Mirror) / SEGA_EMU_V455.pkg (6.3 MB) / SEGA_EMU_V455.pkg (Mirror)
In the Tweets below, he mentions although they are native emulators not to expect too much stating that they are far far away from perfection.
How To Play NES & Sega Emulators On 4.05 & 4.55 PS4 by Andrew Marques
NES & SMS Emulators For PS4 by MasterTurkey
HOW TO Play NES and Master System Games on PS4