Yes, it's real. The email was sent to all dealers.
And it seems that all dealers have now redacted their statements from yesterday on this and other forums.
Didn't realize this was such a big deal. Stopped by a new DJI retailer yesterday in the Seattle area, asked about the Matrix. The employee's voice dropped to a near whisper and he said "I can't talk about it." I thought he was joking, asked again and he replied, as his eyes kept sweeping the area to see who was listening, "I'm serious, I was just informed that we are not allowed to discuss this, now let's talk about the P3 or Inspire."
So my curiousity piqued, I headed on down the road to The Copter Shop in Woodinville, asked the young man there about the Matrix. His reply; "Haven't heard a thing about it" I asked again, same reply. But both times he answered he was looking directly at the other employee, not at me. And I would expect a normal response to be something like "Haven't heard about it, what is it?" or at least he would ask his coworker he he'd heard about it.
Came home and googled it to find that all the previous information had been pulled.
Can't help but think it might be a publicity stunt of some sort on the eve of the 3DR Solo release.