Back in 1996 Square just started to cooperate exclusively with Sony. As a part of the deal Sony promised to publish the first six games in the U.S. With a new Square marketing office in the west, the two companies worked together in order to achieve maximum success for both the PlayStation brand and Final Fantasy 7.
Polygon now presents the marketing planning documents, many of which are early drafts. However, they let us catch a glimpse of how Sony perceived the market back then. You can download the documents here. There are also marketing documents for Final Fantasy Tactics.