The PS4 can now emulate PlayStation 2 games | Ars Technica
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,
PS1/PS2 emulator for the PS4 - YouTube
The PS4 can now emulate PlayStation 2 games | Ars Technica
Sony quietly launches PS2 emulation on PS4 | VG247