To quote from the article the pictures came from:
A supporters’ flagpole is then set alight in The Goblet of Fire, out next year.
Let’s hope Harry isn’t burnt at the stake!
Well, given that there currently is another book out that is not titled Harry Potter the Reanimated Shambling Crispy Horror and the Order of the Phoenix, I think we can assume this.
I think that you'd have to have been living under a box in the back woods of Tibet, deafened, and covered your eyes regularly, not to know that there is a 5th book and most likely a 5th movie.