I thought mine was OK but I got a little paranoid after reading this thread so I took a closer look - and sure enough - specks of dust under the screen
They're only visible with the sidelights on, and they seem to be between the touchscreen and display layers; the display assembly itself should be airtight but I'm guessing that the addition of the sidelights also introduced a design flaw that allowed dust to get in during the manufacturing process. Fingers crossed that it doesn't get worse...