here is actually what stock apps might look like....
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Personally not impressed if so. These are from the WWDC app so it may not look like this but wouldn't be surprised if it did. It's extremely bland in my opinion. While android, bb10 and ubuntu mobile also use a flat design, they have design elements that help spruce up the flatness
Blackberry
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Android
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Notice the fluency in design on both? I am not a huge fan of the bb10 design but it is generally fluent and not as bland. Android does this even better. Even apps with white top bars use more color somewhere to balance the design. Not only is the WWDC app bland, it uses some 3dish elements and some flat ones which make it look out of place. For instance, on the top bar, you can switch pages by pushing in one side of the button. However the button itself looks out of place and bland. Pushing it in yields a very dark gray with shadow highlights. The gray is too dark and there is far to much grey/white in the app with little contrast. Also while gradients from the top bar and bottom bar were dramatically reduced, the gradients In the section headers are very noticeable.
What I think was done right (and hope do Cary over) is the bottom bar and icons, and the keeping of shadows.
What I think needs to change is the overuse of gray tones. Idk maybe I am just going crazy but I really think there is potential, but if this is what to expect, I feel like ios will actually be really bland. It literally looks like someone just took all the color, texture and gloss off of the current ios and didn't make any tweaks to balance the design.
Of course this may not even be close to what ios7 looks like but it is the WWDC app so there's a fair chance it is.