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This release also include some new features as well, the complete list of new inclusions can be seen in the details provided in the R4 release notes below. This release is built on v1.8.8 (of RetroArch) and the update also includes some new libretro core's for the PS4 (gameOS) and those include PPSSPP (PSP), MAME 2015 (Arcade), Beetle Saturn (Sega Saturn), VitaQuake 2 (Rinnegatamante's Vita Port), Opera (3d0) and various other retro console from the past as seen in the listing of new cores included.
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While there there has been alot of cores converted to the r ecently released Open SDK (OOSDK) due to the Open SDK still being new and in the early phases something's like libc++ support for instants is missing support and thus preventing some libretro cores from being converted to the Open SDK currently (More then likely when everything is converted we will see this port actually become officially adopted by the libretro team). Scene Homebrew developer released RetroArch (PS4) R4, since the R3 release we have seen a number of changes and improvements to the multi-system emulator that is still considered an unofficial port.
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