When is a gameplay video not a gameplay video? When it's a choose your own adventure 'interactive' gameplay video, duh.
Bethesda's put out an interactive video for Dishonored, showing the myriad ways you might want to approach any given mission. Or, I suppose, videos. It/they certainly give a flavour of the tactics available to you.
You may wish to keep an eye on these parts for a review in the not-too-distant future...