Charles Martinet Who has voiced Mario since Super Mario 64 will no longer be lending his voice to the legendary plumber.
Nintendo have also confirmed that Martinet is not involved with the upcoming Super Mario Bros. Wonder which means both Mario and Luigi will be voiced by new voice actors.
Charles Martinet will continue to be involved with Mario in his new role as Mario Ambassador travelling to events around the world and meeting fans.
In my completely unsolicited opinion Chris Pratt should have been Luigi and Charlie Day would have made a better Mario.