>>719080415
They'll be good
>Orks
Melee mob faction, large quantities of cheap shit that want to rush in close
>Necron
Small quantities of elite generalist units, rely on spells and abilities to even the odds
>Space marines
Small quantities of elite units specialist units, rely on simple rock paper scissors matchups to win
>Admech
...
They're going to be the spammy ranged DPS faction to counterpart Orks, probably with a lot of powerful damage spells, so that we have two simple brainless factions with opposing playstyles (orks, SM) and two complex factions with opposing playstyles ('Cron, Admech).
Ranged DPS and spellcaster factions are ALWAYS overpowered in RTS games until they're nerfed 50 times. RTS devs famously don't understand the math that goes into their games.