I'm curious as to what value would that provide most end users of the content? If you're a photographer perhaps you have software for processing the raw file and you want to see what you can do with a raw file; however I still feel that for most end users this would be useless. I would be one of the few I think that may play around with this.

Wouldn't help much for a "camera review". The raw would just be a black-and-white mosaic that would look awful. What you want is the processed jpeg out of the iPhone along with the edited ProRAW. I'm not sure if the iPhone can do this but a lot of cameras can shoot in RAW+JPEG mode.

Traditional RAW* wouldn’t be a black-and-white mosaic. It just would be data. RAW’s need to be demosaiced to be seen visually, which makes it dependent on software (or algorithm).

* I don’t know about Apple’s ProRAW.