Hence why I don't think a matte screen is ever coming. If they remove the glossy glass, they'll have this odd looking set back LCD screen, and it'll just look tacky.
They'd have to redesign the imac by moving the LCD screen foward so it's not set back so far, and the removing the glossy glass. I just don't see it happening like that.
If anything, as rainydays said, they'll probably treat the glass, but even that won't be good enough for some of the "whiners". I also personally think it'd be cheap of them to try and claim that as being a matte screen.