Steven Spielberg directed the first four Indiana Jones films, but he is not directing the fifth film. James Mangold is directing the fifth film, which stars Harrison Ford as Indiana Jones.
While George Lucas is not involved, Steven Spielberg is still a producer on the fifth film.
So, to clarify:
* George Lucas is not involved in the fifth Indiana Jones film.
* Steven Spielberg is a producer on the fifth film, but not the director.
* James Mangold is the director of the fifth film.
* Harrison Ford is reprising his role as Indiana Jones.