Re: FCC approvals.
As soon as a new phone is approved, it will show up at the FCC search site.*
A company may ask for short-term confidentiality (usually until sales begin) of everything except the test reports and label placement diagram. In other words, no user manual, pictures, etc until sales launch.
The test report lets us know what radios are inside.
The label placement diagram almost always gives away the general shape, which was important for the first model, but not so much for later ones.
A company can also ask for long-term (standard) confidentiality of circuit diagrams, tuneup manuals, etc... and Apple almost always does so.
*The exception is if you have a FCC-certified third party agent do the tests and grant approval. They can keep their approval itself secret from the FCC right up 'til the day you start selling. I don't think Apple has ever done this, though.