Well I recall reading that the liquid metal technology would allow for better antenna reception so that would get my vote if true. Failing that, I actually really like the look of the plastic shells that have been leaked, however unpopular that may be.
I really don't understand it, whatever Apple, and many others, call it.
I think if Apple doesn't add some stuff to their vision, focus, and road map, people will start to go elsewhere. We're not talking about every size and shape under the sun, just 2 (like they do with everything else).