What appears to be the final Hardy Boys book to be published by Simon and Schuster for the foreseeable future is now available at local bookstores.
(https://www.hardyboyscasefiles.com/images/comingsoon/CB017.jpg) (https://www.hardyboyscasefiles.com/series/cluebooks.php?book_no=17)
I will say that a new Nancy Drew Diaries book was announced out of nowhere, so they may be waiting until the Diaries series is dead before rebooting.