Industry analysts have suggested that Rockstar will launch GTA 5 for PS4 but that the next-gen title will not be available at launch.
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GTA 5 will no longer have the Rockstar Editor on PS4 and Xbox One - Meristation
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GTA V PS4 Needs 44.9 GB of Free Space : r/PS4
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Why is the ps4 version of gta 5 locked on ps5 : r/playstation
GTA 5 loads three times faster on PS5 than on PS4: time comparison - Meristation
