The tech they are using for RT is based off of Nvidia tech. They are going to have to translate all that shit over for AMD hardware. It being an Nvidia sponsored title means they are using NV plug-ins for a lot of their next-gen tech on release, which means NV sent people to help them add it in, as well as did extra work on it themselves. It's not as simple as just erasing NV and adding AMD to a prefix. Shit is gonna take a while to translate over and even then, it will still probably have to be optimized/scaled to even run on consoles hardware. I wouldn't hold your breath for a "next-gen" patch for at least six months, and even then, that's probably being generous as they'll be busy hammering out bugs and also working on expansions/DLC. Simply, the only way to play the "next-gen" version is gonna be on PC and with only NV hardware for quite a while. It sucks, but it is what it is, Nvidia sponsorship+bigger user base for PS4/Xbone+8(+) platforms it's being released on, PS5/XsX are just gonna have to take a back seat as it's just not the fiscal priority at the moment. The upside is that you don't have to PAY for a next-gen update, so the consolation is that if you are playing the game on a PS5/XsX you're at least getting the best possible "console" experience available over PS4Pro/XoX as far as stability and resolution is concerned.