Oh cool.

So I guess some creatures can keep going even if they lose a limb. If so that is pretty neat.

Something like the Carrion Crawler from old school D&D.

A variant of super mutants that have dense but segmented armor plates all over their bodies, lots of body hair and enlarged canines.

Feral Ghouls that emit a foul odor that causes the PC to cough and lose AP. Same ghouls, maybe called Putrid Ones, can also snatch up bits of their own sloughing, rotting flesh and fling it at the character.

Expanded synth tactical squads with unmanned drones that can attack you from the air.

A sub-species of bobcat, mutated by FEV, that turns invisible except for their eyes.

Non-mutated deer, bear, dogs, etc. Not necessarily hostile unless encroached upon.

Deep Ones and since you can't have Deep Ones without Dagon, then throw in Dagon. Maybe only if there is a Weird Wasteland trait.

I'm still laughing at the "Raider Scum" shown in the gunplay trailer

Ya I was wondering if this was something like Yellowstone (a sorta natural thing well after nukes natural) or if Spouts were actually mutated things mostly stuff with a blow hole (giggity) or squids as they are quite adapt at spurting water when they want

Mutated Black Squirrels.
I've seen some out east that seemed much larger than the grey squirrels that we hunted in the Midwest.

Raccoons.

What about opossums? I feel marsupials are under represented. Plus they would naturally be an enemy suited for the night.

Mutated opossum would be terrifying!

The reintroduction of sentient Deathclaws, or Stealthclaws (Deathclaws that have retained their chameleon ability to blend in with their environment).

giant beady eyes and a mouth like http://0.media.collegehumor.cvcdn.com/68/44/1be8b5f7d894f749034c4707df01b62b.jpg, lined with razor sharp teeth.
My grandparents did some subsistence farming out in Missouri and every so often a possum would get in to the hen house in the night- you could always tell when it was a possum, as they normally eat just the heads of the chickens.
So... that, but giant.

The Kardashians

rabid crow swarms that attack you on sight

No thanks! I had enough trouble with birds in Far Cry 4 and Borderlands. Those animals are bloody dangerous. If they ever rise up we are in big trouble...

Ooh Ravens!! Oh wait... no, noooo! Cliff Racer flash back!

hmmm... I think I'd like to see giant mutated snails that spew acid or maybe giant mutated slugs that spew a sticky substance trapping you.

Water creatures we saw they can do hostiles that can only swim in Skyrim and fish so I'm hopeful that the rivers, lakes and sea will feel more alive.