I think you should take a hint at the Xbox FTC document for 2028 being a suitable year when most variables suit an actual next gen. There's a lot to consider before pushing out new hardware especially as a console. Its far harder than adding a Zen 6CPU RDNA 5 GPU, larger amount of ram, accelerators for AI. The most important question is actually what are the developers doing and you design the hw back from the software perspective. Thats the biggest lesson from the Xbox 360 gen and its what Sony and MS have been doing(exception being the Series S and some choices of on the Xbox One). You're looking at it from purely hw perspective and one which considers it as simply ordering components and putting them together.
But these machines require a lot of software support and need to ride economies of scale to provide long lasting profitable machines. Not just churning out loss making machine after loss making machine. These machines have to be planned for years, data analytics taken from memory and processor usage on the consumer and devkit consoles, working with finance department to ensure the cost can be armortized over the life of the generation. It starts from the Software side first not the other way round. And even with GTA 6, MS making a "next" gen machine in 2026 wouldn't offer any meaningful advantage at all compared to the PS5 pro for the following reasons:
- Game is going to be designed around PS5 hw and that will limit what can be achieved on the next gen 2026 Xbox in 2025-2026 period
- Rockstar(like most serious devs) would not take time ramping up to new "next gen" SDK in 2026 when they're current engines are optimized for current gen requirements and are working on a PC release. The guys delayed the PC release to ensure they release an excellent title on the consoles first.
- In 2 years(2027) Rockstar would get a PS6 devkit to release a new GTA 6 at launch in 2028.
- If 2026 next gen Xbox gets a 2027 special edition GTA 6 then a year later they'd be an even better version of the game launching with a much more powerful PS6.
- A 2026 next gen machine would just hamstring Xbox again. They just need to focus on delivering great games for now and maybe launch 2027 or 2028.
But in all this GTA 6 is going to be bound by the current gen for quite some time. Possibly age better than the previous game but after releasing it on consoles in 2025 I just dont see them giving a differentiated experience with a 2026 next gen Xbox. Even the launch PS6 version of the game is likely not to be that different from the PS5/PS5 pro version. Maybe the online parts of the title will be better, but the campaign is going to be bound by the current hw.