While planning releases for a new product most of the time templates "reveal" themselves. It would be a huge time saver to be able to export existing release plans into templates for further use
The ability to copy an existing release is available today. When you create a new release, you can choose to copy an existing release. I recommend creating a template release that you never ship to keep it clean.
See the release notes announcing this functionality.
Follow the "What's new" section here so you stay up to date on new features and enhancements weekly.