Thats my speculation.
October/November major update - Su35, F15Ex, Meteor and Iris-T for EU and PL-15 for China. And maybe new missiles for USSR, but tbh idk, Su30sm2 already best jet in the game, with Su35 it will be even better.
December major update: F-35, J-20, J-35, Su57, new Rafale with new mica.
I don’t think they’ll add the J-20 and Su-57 alongside the F-35 if 5th gens are indeed added this year. Those’ll probably be added later with the F-22.
We have a tease from the russian stream saying “2026 isn’t over yet” to the question about 5th gen in 2026. At the same time we have Oxy denying the F-22 for this year, which got backed by Smin.
Except they are identical in functionality. Sure the name is different and IRL they are different, but at their core they do the same thing in-game, They block all IR missiles from being used against the target. Including missiles that shouldnt be affected like IIR missiles
(as far as I am aware, IRIS-T SLM is still blocked by IRCM)
Let alone issues regarding radar signatures that definetly has been a problem for years.
I think there is no room to delay it one by one like you said. You can’t give one tech tree 5 gen, and nothing for other. So rush is the only way. F-35 for all EU and US, Su57 for USSR tree, J-20 and J-35 for China. And later in 2027, F-22 with best stealth cover RCS.
And regarding delay, they already delayed it from 2025 to 2026
I don’t think there needs to be any rush to add fifth gens. We are still lacking many key mechanics such as EW and proper datalink modelling in game. Without such things the addition of fifth gens will be broken.