This is the implication, yes. In the teaser, the doctor asks "This planet; what's it called?". This implies that he's stumbled across Trenzalore, rather than going there to consciously face his death, something he did in "The Name of the Doctor", however this was NOT how the Doctor was supposed to stumble across Trenzalore, the silence would've tried to stop them otherwise. The Silence were formed with the sole intention of preventing the Doctor from going to Trenzalore. The events of "The Name of the Doctor" were merely a trick by The Great Intelligence to make him go to the post-11th Trenzalore and open up his timestream for the intelligence to go in and wipe the Doctor from existence. The Great Intelligence knew of the Trenzalore prophecy, and tried to use this to lure the Doctor. This Trenzalore, however, is after the 11th's fall, hence his grave is there, and the Silence really don't give a shit. "The Time of the Doctor" is where he will meet his fall and destroy the silence, however.