With less than a month until Doctor Who revs back up again, some details about what we can expect in the second half of series six are beginning to emerge.

At the Television Critics Association summer tour, Steven Moffat,Matt Smith, Karen Gillan, Piers Wagner and Beth Willis took the stage Thursday and dropped some hints about what we can expect as season six concludes.

Moffat said the impact of River being Amy and Rory’s daughter will continue to resonate throughout the next six episodes and the fact that both Amy and River have kissed the Doctor will come into play.

“You think you know the truth about River,” says Moffat. “You don’t know it yet. There’s loads more to come.”

“It’s going to take some twists and turns. All of the relationships and the whole dynamic is going to change,” adds Gillan.

Meanwhile, Smith says we shouldn’t make any plans for August 27th–except tuning in to Doctor Who, of course. Calling the next episode, “Let’s Kill Hitler” one of his favorites from his tenure as Doctor, Smith says “It just rockets along.” And Moffat adds the episode will change everything.

And as we’ve heard before, there will be more exploration of the Doctor’s dark side in the second half of the season.

“The dark side of a man who could have caused the end of the universe is considerable,” offers Moffat, adding that we’ll see the domestic and intergalactic consequences of that in the final six episodes of the season.

As for whether or not the series might film in America again, Moffat says that he’d like to do it, but only if the story dictated it.

“It’s entirely about story,” he replied. “I don’t think in order to make Doctor Who successful in America you have to make stories set in America. … I’d like to do it. I don’t think it’s necessary. But absolutely, we like coming here.”