The team calls this Legendary Armory, and in short, whenever you bind a legendary item to your player account, that item will be automatically be added to this Legendary Armory,
“Any legendary item that is added to the Legendary Armory will become available for use by all the characters across your entire account at the same time. This removes the need for you to swap legendary equipment between characters through your bank or shared inventory.”
This upcoming update will also touch on the Equipment Template so that it’s easier for you to copy the configuration of these equipped legendary items. The team’s goal with this update is to add value to earning and using legendary equipment. They also want to remove the obstacle of players having to swap account-bound legendary items between their various characters.
Keep your eyes out for this feature and be sure to provide the team with feedback.