They are making some small tweaks and modifications to the design as well. Nothing that really changes the design to the point of it being a new design or a next generation of the existing design, but basically polishing up some things here and there (although not everywhere). The overall design is essentially the same, with the focus going on fixing issues, improving performance and stability, and other things of that nature.
I sure hope they start fixing the bugs. Some of them are driving me crazy (especially iMessage not working).
As for design, I have to really wonder. I don't dislike the way iOS looks overall, but some things are just unbearable.
For example, a completely white with light-grey skinny text for an alarm clock app? I suspect I'm not the only one who wakes up frequently in dark environments only to open my eyes and have them evaporate by staring into the eye of the sun -- I mean, the alarm clock app.
The animation delays are still brutal to me. When the animations are playing (as they do with pretty much every tap and swipe), the entire OS goes unresponsive until it's done. Things like going to the home screen and swiping when it looks ready and having it ignore your swipe because the animation hasn't 100% settled is pretty lousy. Worse yet, when the keyboard pops up and looks ready, and you start to type only to realize it missed the first 4 letters because it wasn't paying any attention.
Trying to swipe something horizontally when it isn't 100% settled vertically is also impossible, which can be annoying (for instance when trying to close Safari tabs).
The whole experience just seems to be worse, IMO. I overall like the new look enough (though a dark theme wouldn't bloody kill you, Mr. Ive?), but the feel is sluggish compared with what it used to be.
I just wish they would fix it. The fastest and most fluid iOS experience I've had was the iPhone 5 on iOS 6. I fear it may never be that way again if Apple doesn't care to address it, which they certainly could.
I remember when it was a big deal how responsive Apple's touchscreens are because they were many milliseconds quicker than other brands. Now I have to wait before it responds >1000ms anyways.