Less letters and more live streams, they show off what they can when they can, and they showed off a bit a few weeks back. They just released a huge expansion and honestly they are working towards 3.1 you can't expect them to slow down production just to continuously relay info.

What you are asking for is going to occur September 19 and they've even been kind enough to make a post about it the other day or so http://na.finalfantasyxiv.com/lodest...faea886fb53722

It wasn't til a few weeks ago where we learned "Lords of Verminion" is going to an actual thing

Hint at NPC based army units for players

Sky dungeons taking the place of a high level dungeon per expansion

Hints toward raid etc.

So they are still giving out info, it's just rather than it be monthly letters or whatever they do it when they are near ready, in production and such so that they don't have to take a step back and say "oops sorry we can't deliver on this" and honestly they have done that with some content already so it's understandable why they would only want to speak on content they have in production and not just ideas that are still at the planning stages.