This morning Asus' ROG page posted this status.
"The new Matrix is on the way. Stay tuned September 2nd for #IFA15. #ROGIFA"
This picture was also included.
Now, I believe the timing is right for it to be a GTX 980 Ti. It was almost two months ago that CowCotLand claimed Asus revealed the GTX 980 Ti Matrix, Poseidon, and 20th Anniversary card. However, I've placed the two pictures side-by-side... tell me if you notice something different. That's right, the picture on the top has less red on it and more black, just like the new Maximus...