This was just posted by Yoshi-P, maybe you'll find what you're looking for in the next letter.

このポストを皮切りに、数日かけて幾つかのポストを行いますが、
FFXIVと現世代MMORPGについて、吉田の考える根本的な方向性を
次回レターにて記載させて頂く予定です。レター公開後は、そちらも併せてお読みください。
……とはいえ、現状の作業状況を考えるとレターはパッチ1.19公開直前になりそうです。
その間、パッチ1.19の進捗は、ご要望頂いている、動画にて公開予定です！
Starting this post I will make several posts in the next few days, but I would like to post in the next letter about how I see overall direction of FFXIV and current generation MMORPG. Please read through that also once the letter is released.
....but saying that, with current work load the letter most likely going to be right before patch 1.19 release. Up til then, we are planning to release the requested video which shows the progress of 1.19