There's always a backlash with leaks but this is uglier than every other iPhone leak in history. The iphone 4 was gorgeous from the get go, the iphone 5 was sorta dumb looking, but this is extraordinarily bad.
I fear that Jony's aesthetic without Steve's guidance is this sort of design. I hope the seed has been planted in Tim's mind to start looking at acquiring a new industrial designer. I do think Jony did a good job with IOS 7 (aside from the dock transparency bar, which looks even worse in Yosemite).
Iterative or incremental design evolutions are necessary, but the giant leaps come from mutations, risky and many fail, but the successful ones write history. The challenge is getting a designer with instinct and vision into a position of authority within a company, which requires a ceo with great taste and vision. The post Jobs Apple is firing on all cylinders and may be an even better company than it was, but without a tasteful leader, design will be their biggest challenge. And for me, that's a really large part of their appeal.
Edit: I'm over reacting, it's not that bad, but it looks like a shrunk ipad with vinyl pin stripes.