"It's not like it was creating new silicon; it's merely putting two processors in one package."
I know its an unnamed source. I know it might be a clueless marketing person. However, this combined with Intel's vagueness about it and lack of a roadmapped codename lead me to believe it was not a single die.
I'm not calling Intel a liar, it was dual-core and in the same package, I just doubt it was on the same die.