In your PTR folder copy over your WTF/Account/SavedVariables folder and your WTF/Account/PTR Realm/Character/SavedVariables folder.
Also copy your Interface folder if you are using different addons.
Maybe store them on your Desktop until the patch goes live so there aren't any weird conflicts with live settings and on patch day move them into your Live game folders.
Gershuun @ Borean Tundra US - Interface & Macros Moderator