Just to underline that again, personally I'm not a glossy lover myself (I prefer semi until they start building glass panels with proper diffraction), but glossy
does have several benefits.
One that was not mentioned yet is that glossy/even surfaced panels appear brighter, or better to say more contrasty for the same amount of energy, or to put it the other way around, use less energy for the same appearing brightness/contrast (compared to the surrounding light). Glossy is more white on black, matte is light grey on dark grey. For the very same reasons Viewing Angles (contrast) and Sharpness (contrast) on glossy panels are better!
Well, to be exact, matte panels are just worse. That is because the very same diffusion that happens with reflected light also happens with emitted light coming from inside the panel itself. I mentioned twinkling and silky appeal of large colored surfaces before, same reason: Light doesn't travel out of the panel evenly spread, but is diffused, thus leading to interferences of colores. That results in angle depending color shifts, washed out appearance, loss of contrast and thus loss of viewing angles.
Here's is a "constructed" example what the rough surface of a matte screen looks like compared to the even/smooth surface of a (more) glossy screen. At that angle the smooth panel may reflect more of the objects in front of the screen, but it also shows more of the
onscreen panel-image.
In fact the effect of the dust on the surface is about the same as the rough surface of a matte with the exception that dust usually is less transparent than panel material.
Which leads us to another aspect of Apple "glass" front. Yes, you will likely "want" to clean it more often. But that is not a bad thing, because dust and fingerprints happen on any screen (including matte), it's just harder to recognize. I even suspect that the rough plastic surface of matte screens is far more prone to dust collection that the smooth glass surface.
Last but not least, cleaning the sturdy and hopefuly scratch-resistant glass surface should be alot easier than the rough and flimsy plastic ones.
PS: Now I'm off for the next Apple store to have a look at the new niceties. I'm a musician and upto now PC user and mostly wanting to get the much overpriced Macbook Pros because they are kind of a standard in the music biz. (Alot of musicians/producer swear LOUD about the loss of Firewire on the Macbook, I can tell ya!)