Screen problem could delay iPhone 5

Our sources seem to think this is the case
The problem centers on issues with the touchscreen glass that is being affected by what is described as a “delayed bubble”; apparently this is a difficult problem to look for until the touch screen glass has already been through multiple steps and is late into the assembly process.
While it is unknown how long this delay might be or how many phones might be exhibiting this issue, at least according to a number of reports, both of the companies making the touchscreens for Apple say they will meet their commitment on time. Still, whispers are that with the number of defects due to the “delayed bubble” problem it surely seems that Apple will not be able to get their target number of units built.
Stay tuned, as we don’t think we have heard the end of this issue and what Apple’s plan is going to be surrounding it.