It is worthwhile to note here that your business may at an increased risk of losing out on potential customers if the target audience is under-targeted.
You can click subscriber preview for personalization and code rendered for an individual while creating a message in Content Builder or Journey Builder.
By doing this, you can preview the personalized message that will be sent to the subscribers.
Previously you could only create and send a message using GroupConnect or via Chat Messaging API.
Greater confidence before the activation of journeys can be achieved by sending test emails and visualizing the best-possible expected path for each sample contact.
Moreover, the Journey Builder feature of the new release supports new attributes and objects within existing and new objects.