Immortal Wolves / Lethal Mutations

Does anyone know if we'll get them during the game's official launch? 

I just finally manages to get my 1% fertle female pregnant and if she births a mutie, I don't want the pup to die.
And on the flipside, will lethal mutations come into play during launch too?

I think lethal mutations are already in the game. They are just really really rare.

As for immortal wolves/slots, I'm afraid only admins know when they want to put them in the game. I think it will depend on how much time it will take to code it into the game.