According to Redmond who spoils each season on the theme and cast, season 33 will be all Newbies and Season 34 will be Returning players.
Season 33 Cast : Survivor: Millennials vs. Gen X
Adam Klein
Bret LaBelle
Chris Hammons
Ciandre Taylor
David Wright
Hannah Shapiro
Jessica Blain-Lewis
Jessica Figueroa
Justin Starrett
Kenneth McNickle
Lucy Huang
Mari Takahashi
Michaela Bradshaw
Michelle Schubert
Paul Wachter
Rachel Ako
Sunday Burquest
Taylor Stocker
William Wahl
Zeke Smith
Season 34 Cast
Andrea Boehlke S22 & 26
Aubry Bracco S32
Brad Culpepper S27
Caleb Reynolds S32
Ciera Eastin S27 & 31
Cirie Fields S12, 16 & 20
Debbie Wanner S32
Hali Ford S30
JT Thomas S18 & S20
Jeff Varner S2 & S31
Malcolm Freberg S25 & 26
Michaela Bradshaw S33
Ozzy Lusth S13, 16 & 23
Sandra Diaz-Twine S7 & 20
Sarah Lacina S28
Sierra Dawn-Thomas S30
Tai Trang S32
Tony Vlachos S28
Troyzan Robertson S24
Zeke Smith S33