I'm not so sure about the light thing either but FTMP, these are not gossamer-like skis (think AT). Head does have something pretty remarkable in the lightweight genre but most are somewhat lighter versions of what a company already had (think Hell & Back vs. Enforcer for example). Also, keep in mind that much of this is just new season talk. If a company rolled out a new ski lineup and started talking about reinventing rocker they would get a collective yawn. If they started out by talking about their three new powder skis.......same thing. So......this is a new thing to talk about and they do have to talk about something.
FWIW, when we are talking at the ski wall, there is usually a pretty positive reaction to lighter weight skis and certainly we all know that many of them ski really well so the lighter weight is not an automatic negative.