Yes, I know where it's from, and was not doubting it. Some official sources say one thing, others do not. That's why I said there's "conflicting information on this depending on which official promo you look at". Because, depending on which official promo you look at, there's conflicting information on it.
The PS Blog post, for example, very much suggests that the Power Pack requires Spec III/1.64 and since that launches on December 4 it hints that Spec III/1.64 will arrive either at the same time or before. Meanwhile other official statements don't directly link the two.