Miller's announcement comes three months after stating his recruitment was "107% shutdown."
Haynes decommitted from Rutgers in May.
Parsons has sent $25 to at least 18 fans already to help them combat the record-high gas prices.
Penn State is one of approximately 35 major programs to enter into an exclusive rights deal with the sports trading card brand.
Ki-Jana Carter, D.J. Dozier, and Paul Posluszny will represent Penn State on the ballot.
Locke will join the Class of 2023 as its latest commit.