nil
if the use of the novels will give you a good answer, then you shouldnt worry about it. but keep in mind markers are looking for multiple text types. using 3 novel texts could possibly threaten marks. but no one can stop you, if it is your choice to use the novels.
probability
i do agree that there is not much chance it will be included, as it has been over looked previously. although that may be reason enough to put it in as a change. it is virtually impossible to predict what may and may not be included in an exam. but yes, if it was in there, it would...