Mitchell became the third Nittany Lion to hit the portal this spring.
Saltz won her first Midfielder of the Week while Long took home Freshman of the Week after beating No. 22 USC over the weekend.
Ryan DeSanto tossed seven complete innings for Penn State as the Nittany Lions completed a late comeback win.
Wheatley is now Penn State's oldest defensive back following KJ Winston and Jaylen Reed's departures from the program.
Williams will make her third head coaching stop after previous stints at Georgetown and Auburn.
Three former players made the NCAA Tournament with their new programs.