As I was saying before, I think part of the reason for making the amendments now is that although these aspects are in the common law, the common law is not as accessible, particularly for people who are not legally trained, as a statute on the books.
The idea is to codify the three elements, of minimum age, the requirement for free and enlightened consent, and the requirement that all prior marriages have to be dissolved before you can marry. It's not that any of these, except for the minimum age, are new, but just to make sure that it's all clearly on the books.