I have seen some posts which mention an official Arduino wifi shield with an H&D module, but I can't find where to buy it. Does it exist? Or is it supposed to come out in the future?
Unfortunately some of these products announced almost a year ago still remain a mystery. There was not to be much heard after the initial announcement.
The Leonardo exists, but if the rat of the boards appear at this rate well wait at least another year for the WiFi shield :-/