You can join book clubs that focus on romance novels. Members usually discuss and share information about upcoming releases. There are also online forums like Goodreads where you can follow groups dedicated to romance novels. Here, readers exchange information about new books that are about to come out.
One easy way is to follow romance novel publishers on social media. They often post about upcoming books. For instance, Harlequin, a well - known romance publisher, frequently shares news on Twitter about their new releases.