I don't think it's the Sporting side skirts - the 'stripe' one I saw had aftermarket sideskirts and an aftermarket spoiler, if I remember correctly. Maybe the dealer had just put them on for a customer.
I could be wrong though...
Here's al ink to a dealer advert for it.
http://www.arnoldclark.com/nearlynew.html?=fiat
Sounds like a dodgey dealer version! Official 'Limited Editions' have the Sporting side skirts and spoiler.