Rockstar hasn’t exactly shied away from re-releasing GTA5; the game originally launched on the PS3 and Xbox 360 back in 2013, followed by a release on PS4 and Xbox One the next year, and then a release on PC in 2015. Now, they may be getting ready to have another release readied up.
A listing for Grand Theft Auto 5 Premium Edition has cropped up on Amazon- for PS4 and Xbox One only (before Switch fans get too excited thinking it’s indicative of an upcoming Switch version). There are no details whatsoever on what this might be, and oddly enough, it is listed for a March 23 release date, which seems to indicate, in turn, that this might not be anything major.
If I had to guess, this will probably just be GTA5, with some currency and credits for GTA Online included as part of the base package- but who knows? Hopefully we get a proper announcement letting us know what to expect soon enough.