If we were to send up a new interstellar item designed to convey information about humankind, what scientific developments have been made in the last 50 years that would change how much/what types of data we could store on it?

Right now, these are the only three countries with independent human spaceflight capabilities. Several others have ambitious space programs, but developing a crewed spacecraft, launch systems, life support, and safe reentry is an enormous challenge.

If you had to bet on one country becoming the fourth, which would you pick, and why? And how many more years will it take?