I’m almost certain that there will be more episodes. Isayama (I think that’s how you spell his name), said something about how he didn’t like Game Of Thrones Season 8, probably due to how rushed it was. I’m pretty sure this foreshadows that he wouldn’t want to end the show so soon, so we can likely assume that at least another eight episodes or a movie will be made later this year or next year. But at this point there’s still nothing confirmed, so we can’t jump to conclusions yet.