I've heard that it's not Skrulls because Skrulls are part of the Fantastic Four movie franchise which is currently owned by Fox. The most popular rumor seems to be that the aliens are loosely based on Skrulls but will be called something else.
Just to let you know, superheroes fighting each other? You don't need Skulls for this to happen. Good guys fighting each other is pretty in vogue right now.
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