During the Kingdom Hearts Orchestra - World Tour - held in Japan on March 10th, 2017, Yoko Shimomura discussed the music played at the event in the Official Concert Guide. You can take a look at her thoughts on the brochures provided by @RedMakuzawa and @jsjunshen.

There is also an interview with her providing information on her inspirations, an image showing the artworks for all three Kingdom Hearts HD collections and how they connect, and some new scans.

We will update the article with higher quality scans once they become available, as well as a proper transcription to read for both Shimomura's thoughts and interview.