The entire goal of the campaign will be to declare one faction the winner, before restarting.
Developer Miguel Caron explained, “One of the things I hate in massive warfare games is that there is no winner; they never finish. So what we’re aiming for is campaigns that run from two weeks to three month. The reason why I’m saying from two weeks to three months is because I don’t know who’s going to win, and how fast they’re going to win.”
“If I see a huge population of Space Marines playing in the US for a new campaign and they outnumber everyone else to the point they’re about to wipe out the entire planet within days, suddenly the Tyranid would be a lot more interested in them.”
Caron concluded, “We’re not going to try and counter that kind of imbalance too much, but enough to help campaigns last for those two weeks.”
Warhammer 40,000: Eternal Crusade was announced last week, and will be hitting PCs sometime in mid-2015.