From what I understand of the used car market, values including factoring in of previous discounts to sell a certain model. So if Ducati was giving away $1,500-$2,000 to get rid of 2012's, then all 2012's will have that factored into their depreciation. My MV Agusta was like that. MSRP was $23,000 new but because of the deep discounting to move them off the showroom floor, within a year they had a used value around $16,000.
However, motorcycles are not the used car market, much more rare and not a "necessity" that cars are. Prices are influenced significantly by demand for a particular brand/model. I think we see Pani's getting killed on pricing here in the classifieds, but when I see them on eBay they are being advertised for much higher. Whether they sell or not is another story.
I can't imagine Pani's not being as desirable as a 1098/1198, when they are ~25 lbs lighter with 25+ more rwhp, and service intervals are 250% longer. Those bikes appear to be holding their value well, so I would assume the Pani will stabilize and hold its value as well also. At least I hope so.