I think I actually prefer this mock up over the black ones from last week. This seems to have more of the premium look than the others. Maybe its the color, but the black mock ups made them look cheaper/non apple/plasticy.
I think the top and bottom portions of the wrap around alum though stretches a little too high up.
I think the more curved rounded feel would be a plus. I enjoy the rich feel of the IP4/5 lines, but I think I would prefer the curved aspects of some of these mock ups better.
The one posted above from Zach Nathan I think would be the most ideal for a production version though. Still looks to have that nice chamfered edge to keep it looking rich and give appeal, but still rounded for comfort
the New M8 is a very fine example IMHO. Feels very good in the hand from my limited playing with it and still has that rich feel with the aluminum on the back. I gotta say, if I would jump ship, it would probably be for the M8