noun
latest work; newest work; most recent work
Refers to the most recent creation of an artist, author, director, etc., such as a book, film, album, or game.
監督の最新作は来月公開される。
The director's latest work will be released next month.
この作家の最新作を読みましたか。
Have you read this author's newest work?
旧作 means 'old work' or 'previous work', the opposite of 最新作.
Compound of 最新 (latest) + 作 (work).