Saw another leak today, either a real snapshot of the Warlord traits or a cunning fake. Edit: this broke on 4chan here.
Some to me are very much better than others:
Born Survivor gives some survivability, but not something to rely on.
Wall Creeper can get you through crowded boards pretty quickly.
But the stand out is Ambush Leader; being able to choose how you enter and bringing a unit with you is going to be very strong.