Mobile cameras with periscope lens have been around for a while, and it looks like Apple will use this technology for the iPhone as well. However, nothing is official yet and this is only expected to happen in 2022. For now, it seems that the tech giant is looking for suppliers to provide the needed hardware parts.
https://www.notebookcheck.net/Apple-s-iPhone-2022-lineup-expected-to-feature-periscope-lens.482657.0.html