No one knows, period.
First off, I dont necessarily mind this new design, but I would have liked something different, but its far from terrible. Ill still get one, but it doesnt mean that new is always better; Im not quite fond of the long screen.
However, there are two scenarios that will come out of this. The first is that this is NOT the real design and this is a leak. Not sure if there will be a grand release with Tim on stage throwing this one out- but I also recall on the first iPhone release when Jobs showed a picture of the iPod with a numeric and alphabetic scroll button which seemed to get some laughs! Granted that was only a pic, but still
The second is that this IS the design, and Tim has now shot himself in the foot declaring that security has been "ramped up although this leak has been out (almost?) longer than any other design leak. It seems hes going to be criticized for either the design or his failed attempt to keep things hush-hush. If this is a leak, he will likely be praised for his protection of parts/design and (hopefully) will unveil a newly redesigned iPhone 5 that truly shows the hard work of Jony and their team for the past 2 years.
Just my $0.02.