This week (Oct 16-23) in emulation: RetroArch fixes input issues on PSVita/PSTV, PS2 port of RetroArch is in development, Switch Overclocking for better emulator performance, PS4 FW 5.05 gets a NES emulator,
Looks like the PS2 emulator on PS4 won't work with discs or Classics – Destructoid
When playing PS2 game using PS4 emulator, it works null null at 60 fps - GIGAZINE