We've been seeing various Q8 concept vehicles over the last two years or so, and Audi previously said that they would officially unveil the Q8 this June, but it seems that they're beginning to a tease an SUV model that most definitely looks like a Q8 on their Facebook page.
While only the vague lines are highlighted, it would most likely be the Q8 given that it's the project closest to fruition. With these teasers, there are indications that Audi may instead choose to unveil the Q8 at the upcoming Beijing International Automotive Exhibition in just a few days' time.
Further hinting that this is, in fact, the Q8, is the fact that Audi has extensively touted its ties to the original Quattro, in various different ways. In this Facebook post they talk about how the genes are related, which is the biggest clue as to what the thinly disguised model is.