Your payment options in your Store Profile will now be automatically selected/filled in when you create listings.
AND
you can select a price profile or shipping profile or tax profile to be the default. So, when you create a new listing, the default selection for price / shipping / tax will be automatically selected and filled in for your new listing. Of course, you can over-ride any of these options any time.
For existing users, there is nothing to do, as the system defaults your first profile to be the default. But you may want to check your Store Profile anyway just to confirm your settings.