Is it Pence? I understand that Trump postponed his announcement at 11am today due do the France attacks. If that is true, then it looks like Pence is not the pick. He will not be able to pull out of the Indiana Governors race.
Pence has until noon Indiana time to submit paperwork to remove his name from governor ballot. I doubt there is any obligation by the State of Indiana to confirm that immediately. It may not be made official for several days.