Roadmaps are now out of Beta and will be enabled by default for all new Classic type projects
Once again, thank you for all of your comments and feedback.
In the existing Classic projects you can enable the feature for your board by following the instructions here: https://confluence.atlassian.com/jirasoftwarecloud/enable-and-disable-the-roadmap-1004952906.html
As always, we’re keen to hear your feedback, so please send it in via the "Give Feedback" button in the product.
For those of you who want more from the feature, please stay tuned. Our teams are continuing to investigate and build improvements for both Roadmaps and Advanced Roadmaps based on your feedback.
Atlassian Product Manager