My understanding is that Apple won't just replace the screen because you feel like it. Of course if it is within the first 14 days you could just get a refund and order one with AG.
Even if you broke the screen, wouldn't Apple just replace it with glossy- I really don't know, as the guy said before call the Apple store, or go to a Apple Authorised Service Centre- they might do it for you (the replacement).
You can also try the $35 Power Support anti-glare film. It's not the cheapest but it doesn't introduce artifacts or color shifts like some other films such as Radtech. I use it on an iPad and 13" MBP. When I compare the 13" to my 15" MBP with a matte display they are comparable in appearance.