I had the same thing in January. My Macbook Pro 15'' early 2008 was replaced for free with a MacBook Pro 15'' mid-2010. Nice thing is that when I bought the Macbook Pro I took the matte display (I think it came for free). But now the matte screen costs some 150$ more than normal glossy display..
However, since I had the matte in my old one, the gave me the matte in the new one..which come with 1680x1050 :D