I wonder if we'll see John Hurt at the end.
If RTD were behind this, I think the probability would be 100%. The only season that didn't end with a cliffhanger-ish "What? What? What?" situation was the fourth (though RTD did write a scene to lead into "The Next Doctor" and it was filmed, but it was also cut).
Moffat hasn't ended his seasons that way. He's treated his specials as concrete units of their own in the past. I'm not sure why he would change that now.
Though maybe he will this time. Six months of people going, "Who was John Hurt playing?" wouldn't necessarily be a bad thing.