I actually can understand why they say "It's not ready" and don't release it until they feel it is. It's a sign they take great pride in their work, and want to make sure it is close to perfect as possible before saying it is ready. I'm the same way. The hobby shop I work for, I recently restored some antique passenger coaches for the owner (I have never called him boss, we've been good friends for so long, it don't sound right) and he was wondering why they took almost a month to restore. He got his answer when I finally brought them back. Full hand made interiors inside, LED lights, passengers in the seats. I could have brought them back earlier, said "They're ready" and it would have been sub par work (By my standards) but no, they took longer, but the results were awesome.
I'd bet DM4 is going to be much the same, it will be more than worth the wait.