Even if there may not be a NT3 there is still the question. what will it be about? nothing has been released yet, but there are hints and rumors. remember at the end of NT2 when the president tells Ben about page 47? and he says i think i can help? well whatever is on page 47 may lead to a plot for NT3. although no clear plot can be determind the writers of NT@ said “We were asked to start there [when writing the third film], so that is where we’ll start. The plan is to start from what’s on Page 47. The idea of the Book of Secrets is spectacular. It’s a great idea. The second movie sort of introduced it and used it as the center of the movie, so it is smart to make the third movie ‘okay, what treasure hunt will come out of the book of secrets’, which is kind of what the end of the movie started.” (slashfilm). and also in this wikipedia article is more Director Jon Turteltaub said that the team will take their time on a second National Treasure sequel, but Disney has already registered the domains for NationalTreasure3.com and NationalTreasure4.com. Though the second film ended with the question about page 47 of the President's book of secrets, Turteltaub responded in a press interview that the idea was not set in stone as the basis for National Treasure 3. so in conclusion expect something about page 47 if a NT3 is ever made. thanks for reading and i hope you enjoyed.