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Well without nitpicking, few core concepts are already coping/improving the ones from vCoH.
Point system alone is probably the biggest change so far, because CoH2 system pretty much affected littery the whole game. And every single point on the map is pretty much point of interest worth trying to capture. Problem with CoH2 system, is not even the amount of points, but rather the fact that usually in total (excluding the VP), there are only 4 points of interests and unless you just want to either delay or cut-off the enemy, there is no reason to go beyond this (unless its 1v1), since regular points are effectively pointless to the economy, making game more static and predictable.
Well and the fact that faction actually have choices now, which will affect the economy. Not the ones UKF had with "Duh, should I delay my AEC by 30 seconds by picking grade" or "Side grades are here to delay tanks".
Those are at least two core differences which arent subject to change.
And if we start speculating about what balance of the game will be, considering relic keeps vCoH in mind, we can expect much less survivable inf, powerfull yet vulnerable tanks, soft-counters actually working as support units (hello deflection damage), over-all slower teching\teching and maybe even the fact that rebuilding LVs\Vehicles or going multiple of them wont put you in instant disadvantage economy vise.
As for commanders, I honestly think, that its just an over-all improvement over CoH2 system, but I have no illusions about them. There still will be top picked commanders and there still will be meta with the most commonly picked abilities, simply because its hard to balance so many battlegroups (since we will be getting more then 3 per faction) and abilities to be equally worth picking. I see them as a massive QoL improvement and game improvement, but not something game changing or ground breaking.
vCoH nailed doctines because there was only 3 per faction with 6 abilities in each, it was much easier to make them distinct and usefull.
But to make it clear, I didnt play vCoH super competitively back in the day so I might not have super deep knowlage about it, but it was enouth to see the difference between it and CoH2 in how gameplay changed and especially after all CoH2 patches.
Point being, a I hear a lot that CoH2 is masterpiece RTS (at least gameplay wise), while imo a lot was really downgraded in CoH2. QoL and UI was improved in it, thats for sure, but not the gameplay. Thats why I doubt that they will like CoH3, if they didnt like vCoH gameplay in a first place, since its a reference for Relic now.