Re: (Spoiler) Left Me Cold
I think the "John Harrison" thing was simply a way to hold off the pre-release interwebz fan furor over the villain being Khan. Not marketing, just simple misdirection.
Personally I think Benecio del Toro would have been a better Khan. A shame he wasn't available - at least, according to early rumors.
I may appear unoccupied to you, but at the molecular level, I'm really quite busy.