Because there's nothing to write about. We know about everything they're supposedly working on; crafting revamp, Cetriss, Slithering Chaos, new AA's, rage server merge (DBA guy is still looking into it lol)..
There's absolutely nothing else for them to say until they finish the content that should been out last year. You can only phrase "it's still being worked on" in so many different ways. Look at previous dev letters in the past year, it's all been about the same things that still haven't been released yet.
It would be nice to receive a progress report on the crafting revamp if it hasn't been cancelled yet.