Is the Pretty Little Liars book series over?

I finished reading Wanted right when it came out in June of last year and i thought that was the last book because everyone discovers the secret and everything but then today i was looking around Amazon and I saw Twisted, a new book in the series and so I searched it up and after that is Ruthless. I am so confused. I thought there was an official announcement saying Wanted was the last book. Someone help me out.