XFX's design has been compared to a "burnt taco," though if going that route, a Choco Taco would be a more flattering description. If you look at it just right, you can see a face, or at least I'm seeing one—the fans are giant eyeballs, the groove at the top is a parted hairline, and the outline at the bottom forms a mouth and chin.
It's like a geek version of the Rorschach test, though you will have to draw your conclusion as to what it says about you. In my case, I guess it says I'm not craving a taco at the moment.
These will include models that ship with factory overclocks, and also custom cooling solutions that deviate from the blower-style shroud found on reference cards. In this case, XFX has apparently gone with a dual axial fan solution. Blower-style shrouds have the advantage of escorting hot air directly out of a case, but in my experience, axial fan coolers generally do a better job of lowering GPU temps while simultaneously running quieter. These traits vary by model, of course.
In any event, look for custom Navi models to land on store shelves withing the few weeks.