Welcome to the Forum! I have not yet had the pleasure of owning an AMG, but as they continue the SLS, that day will come
The article has been mentioned before in this thread and it can very well be a smokescreen for the other teams to get lost in.
I'm more curious as to the source of these rumors and the proposed location and design of the passive f-duct, as there are regulations preventing its incarnation as we all know it (slot in rear wing, siphoning high energy air to it to stall said rear wing) and the benefits of a front wing f-duct (aka W-duct) have been stated as to disrupt car balance and be of dubious value, were it legal to begin with:http://scarbsf1.wordpress.com/2011/10/21/mercedes-f-duct-front-wing/
I have theorized a passive f-duct system could be in the rear-wing endplates (which can be made somewhat hollow, since Mercedes uses the endplates to house the DRS mechanisms). However, as with the front-wing f-duct, how air blowing from the endplates could be of any benefit is a stretch.