I will honestly miss Kor'la, since he was an MC, + pretty damn awesome + lotsa char development... but this is WH40k. If it happens, it will happens.
It's not always a fairy dream.
But! Darius. I will get mad if it's unneccessary drama or a superman save.
"You can use miracles to bring menace for your characters.. but you cannot use miracle to save them."
One of the basic rules of writting.
You are awesome, and I'm sure it will be awesome. Much hype and boobies!