This is the first time I've seen a standard banner with a "Pin it" call-to-action, so I clicked on the button to see what would happen. A pop-up opened up with three items for me to pin--all of which the model is wearing in the banner. I find it so interesting that additional imagery was hidden behind this banner, when there was no mention of it through copy in the banner.
While I think the "Pin it" button does cheapen the aesthetics of the banner, it does what it needs to do--get people's attention. I don't think this was the best use of the new "Pin it" ad format, but I'll be interested to see how other brands use it and whether people are willing to pin from banners.