In the DC Entertainment Direct Channel newsletter 10-17-2018, issue #1423 the following was announced.

THE SANDMAN: OVERTURE GALLERY EDITION TO BE RESOLICITED
DC will resolicit THE SANDMAN: OVERTURE GALLERY EDITION HC.
All current orders placed under item code MAY180599 will be cancelled.

 

The book was solicited in April 2018 for an October 2018 release but was changed earlier this month to “TBD” and now this announcement yesterday.

To be resolicited isn’t a complete cancellation, more like your parents saying “we’ll see”.