So i watched some Skirmish Battles for Dawn of War 3 to see actual gameplay and not what the devs want to show us.
What i can gather from all of this:
Squad Sizes are still what they were in Dawn of War 2 so your armies are not particularly bigger than before.
Energy and Requisition and Heroe Points all come from the same capture points. Some only have one type of Resources, others have all three. There is much less points than in Dawn of War 1 for example. Combined that means that if you are pushed back you can't recover, because you might not have access to one or another type of resources, restricting you massively.
Cover-System has been thrown out...which is a big no-no in my opinion since that was the only thing i liked about DoW2.
Heroes are army killers and essential to the Game. So if you liked it better in Dow 1 where you could deploy your heroes and they were useful and all but not army-smashing behemoths around which you had to focus your tactics and strategy, i have bad news for you: Heroes smash whatever force you throw at them, they are ridiculously oversized (aka force commander is four times the size of normal marines) and you have to micromanage them Heroes of the Storm style, with skillshots and abilities which need to be carefully aimed and all that jism.
Early Game seems extremely slow now after i watched a second game with orks....resources accumulate terribly slowly.
Might be just be the video but graphics are horribly blurry.
Waaghbanners are amusing, apparently you can activate them to give your units some kind of permanent waaagh-bonus, at which point a metal song plays with the orks screaming WAAAAGH over it.
Force Limit is at 250, looking at squad sizes and all, if you throw out all the gretchins and vehicles you get a grand total of 250 orks on the field. That is if you go complete infantry horde. More realistically we are looking at 150 if you really hit the pop limit (which doesnt seem to be easy with the slow resource trickle)
Mission Objective is: destroy two shield generators, destroy two defensive cannons, destroy enemy power core. Now if you can figure out from what kind of game this might be copied you can figure out how the overall feel of the game is like. Yep It's Heroes of the Storm only you also control the usually automatic pawns on top of your heroes.
Bottom Line or tl;dr:
They looked at Dow1 and Dow2 asked themselves what people liked about it and threw it out, then added what people liked about Heroes of the Storm and similiar games.
https://www.youtube.com/watch?v=TpcxKWnnP88https://www.youtube.com/watch?v=ZQKMxKz2J7kThere you go above are the vids.