It's not as if STID would be the first instance of televised Trek with a portrayal of Khan and/or the EW that's not entirely consistent with Greg's novels. ENTERPRISE already established that between 30 and 35 million people were killed in the conflicts, which is a lot more than in the books.
Not to mention the introduction of a new term, "Augments," to describe Khan and his genetically-engineered ilk.
And, yeah, I could have used a handy term like that . . . .