Here's some internet propaganda:
The S7's features Rossignol Amptek profile combining, early raise tip and tail, camber underfoot, reverse sidecut in the tip and tail and sidecut underfoot. Rossignol has created the perfect powder tool for backcountry skiers who have a fetish for skiing the deep.
The most revolutionary powder twin tip to hit the backcountry... The S7 features the Rossignol Amptek Technology combines early-rise tip and tail, camber underfoot, reverse sidecut in the tip and tail, and sidecut underfoot. Says Sage Cattabriga-Alosa; It makes me look at terrain in a whole new light. It allows me to ski new and creative lines. I can slash and smear wind-lips, pockets, pillows and spines that were previously out of play. Rossignol has created the perfect powder tool for backcountry skiers who have a fetish for skiing the deep. Rossignol adds sizes 195cm and 166cm to round out this unique ski. The 195cm or, as riders call it,The Super 7, has a wider waist (117mm) and metal laminates in the construction. The 166cm is prefect for groms and women. 100% Backcountry
This is one for the back/side. My understanding is that it is not a full reverse camber but a big early rise tip and tail. My boy has a pair on order. He's pretty stoked about them. He tested a pair with tele bindings last spring in CB and was sold. He skied Sickbirds last year.