Decrypted text discovered by Rockstar Launcher contains several references to Unreal, suggesting that all three games are being revised for the platform. References to Bigfoot, Vice City and Icons2004: San Andreas imply that Bigfoot will make it into the remaster of the 2002 game, although his absence since the game's release has been the subject of much speculation.
Rockstar does not expect a major makeover when it comes to the remasters of Rockstar GTA games, but the visuals of the games are expected to run on the Unreal engine. The GTA games of the PS2 era were originally developed on a middleware engine called RenderWare, while later parts like GTA 4 used the proprietary Rage engine of Rockstars. Not many details were shared about how the games will look on modern hardware, but some of the following snippets.
It is worth noting that Rockstar Games Game Launcher was the only PC platform included in the press release. Take-Two noted that the company was working on three new remasters and remakes, but was reluctant to say exactly what they were. Rockstar remained silent, but in recent days there has been mounting evidence that adverts have appeared on Korean rating agencies and the trilogy has appeared on developers' own launchers.