From what I know of, they tend to tell us what they plan to do for the next patch or expansion through a live letter on the lodestone site. Sometimes a few YouTubers get to interview Yoshida directly and post the video.

I do remember posting some Monk Blitz ideas that required pushing in GCD Actions to determine which spell came up... It's a reality now but I do not know if they accepted the idea or coincidently thought of it on their own.