The option is also available from the immediate "Transfer now" dialog available from the content editing screen.
Deploy For Scheduled Publishing
When transferring content into an upstream environment, the published status of the items will be deployed too. So if the content is published in the current environment, the changes will be deployed and the item immediately published in the destination. If the content is unpublished, it will be transferred in its unpublished state.
For most situations, this is what is required, and will continue to be the default behavior. However, there are cases where editors have changes prepared and reviewed, want to schedule them for publishing in the future, but don't want to remove the changes from being published in the staging environment.
This option is available now via a second addition to the Queue for transfer dialog, where a publish date can be set. If selected, when the queued items are transferred, the content changes will be saved but not published, and the selected publish date set. The content will then be published live at the appropriate time, using the standard scheduled publishing feature of the CMS.