I get what you're saying about it not really being able to spoil the books, but look at last season, in particular, Stannis burning Shireen. This hasn't happened in the books, but when they were criticized for it, D&D immediately threw their hands up and said "WELL IT'S GONNA HAPPEN IN THE BOOK OKAY?"
Now, I am confident the circumstances will be quite different... for one, Shireen isn't even with Stannis in the book right now, she's at the wall. What I expect is that Mel will convince Selyse to burn Shireen, and Selyse will do it because she's a zealot and sorta fucked in the head. Could be that Stannis will then still lose the Battle of Ice, and his life, which will prompt Selyse's suicide.
And that's the problem... even if the context is different, I can make a pretty good guess as to how it's going to go down in the books, and I don't want to be able to make those kinds of guesses.