I just got back from the Apple Store in Tysons Corner, Virginia.
They only had one new MBP out, a matte 2.4 GHz 15.4" model.
I am definitely impressed. The screen IS noticeably brighter, and whites are whiter and blacks are blacker. I compared it side by side to the older matte MBP next to it, and it was startling how much darker and grayer the old MBP screen was compared to the new one. As some have said, this might be because the old MBP's screen was getting dimmer with age, but even if that's the case, it shows what should be a pretty long term benefit of the LED-backlit screens.
I'm definitely impressed with it though; exactly what I was hoping for, as the screen was my only real complaint about the previous MBP.
That it also has an 8600M GT in it is just icing on the cake for me.
I didn't get a chance to see what it looked like with a glossy screen, but the matte really amazed me....... I loaded up Photoshop CS3 (btw, loaded in like 1 second..... amazing to me), Logic, Final Cut Pro, etc...... and everything just looked beautiful and crisp.
I can definitely see getting the matte screen version.
-Zadillo