Aren't concepts and assets leading up to the actualized product often considered company secrets and rarely disclosed unless they are in direct relation to the finished product? Pretty sure this has even sparked up lawsuits in the past, devs having disclosed or "stolen" scrapped content and concepts leading to the company with ownership getting their panties in a bunch.

With this in mind I think the chances are slim to get anything meaty out of the previous vision for the game other than what was already implemented or revealed, but yeah, it doesn't hurt to ask.