Actually it is. My Coiler has this "decambered nose" thing going on, and the initation is smoother and the nose seems to slice more than plow. It makes sense, because the upturn of the nose is better blended with the sidecut this way. This is important because in real life when the board is carving, the edge is engaged in the snow quite far up the nose. The shape of the nose effectively becomes part of the sidecut.
The nose and tail are on the snow. I fondled one of these boards in the store the other day. The reverse camber is only between the bindings. From the bindings to the tips is flat. So when you stand on the board it "de-cambers" and the ends of the board are on the ground. There's just not much pressure on them. Interesting idea. Probably great for freestyle, because when you shift your weight to one foot, the other end of the board naturally comes off the ground. Lib-Tech themselves seem to admit that there would be less edge hold at the ends of the board, so they add Magne-Traction to make up for that.
their info:
http://www.lib-tech.com/banana/index.html
(see, they're calling reverse camber "rocker" too. that's how I've always heard it used.)