Prada describes Infusion d’Iris as follows:
As elusive and unique as the precious ingredient from which it takes its name, Infusion d’Iris fuses tradition with idealism, heritage moulded to modernity, classicism reinterpreted through originality.
Infusion d’Iris is like a dream, an Italian voyage, an ambiance, the smell of soap, the clean scent of crisp linen sheets, and naked skin. It combines classic, exceptional quality ingredients from Italy such as the Iris Pallida from Florence and the warm top note glow of Sicilian mandarin. It expresses itself through its contrast between a great freshness and apparent lightness and a type of tender veil, sensual, and strong, that envelops the body and the clothing of the woman who wears the fragrance.
Infusion d’Iris evokes an ultra feminine experience set within a world of luxury and Possibility—quintessential Prada universe.
The notes of Prada Infusion d’Iris include mandarin, orange blossom, galbanum, iris, incense, benzoin, cedar, lentisc and vetiver. The Eau de Parfum can be found at Neiman Marcus.
On me, Infusion d’Iris begins with a little bit of a back of the throat twinge, but one different from Iris Pallida. This is a tickle, as if, upon thrusting one's face into a bouquet of irises, one breathed in a little pollen and suddenly found themselves powdered as well. It is a tiny bit peppery, rooty, and even a little waxy.
On dry down, this saucy number softens a bit on me to about half its original umph. Still a little spiced, it becomes less rooty and earthy, and more sweet. It reminds me a little of the taste of candied ginger or spiced candied nuts.
Infusion d’Iris is not the indulgent, tragic super-sophisticate that is Iris Pallida, but that does not seem to matter. This effort is so entirely different it almost seems a different flower, related but nonetheless singular. To me, it is like the difference between the bored way a young woman, full of life and ignorant of her own mortality, mentally drifts away to more pleasant pursuits at a Spring funeral, while the elder widow looks at her spouse and finds herself rooted to the receding vistas of her own invincible youth. Where Iris Pallida demands gravitas, Infusion d’Iris is vivacious and lively. Certainly, everyone has room in life for both kinds of moments.
But don't take my word for it -- here's Robin's review from Now Smell This! and a review from Bois de Jasmin. Prada Infusion d’Iris is available at Neiman Marcus and also from discounters (I'd check the discounters first).