Katie Rose Clarke has replaced Erin Mackey as Glinda (Erin left on 01/10, Katie played her first on 01/14; standby for Glinda Laura Woyasz played the three shows between those dates).
Jenny Fellner has replaced Michelle Federer as Glinda (01/12/2010).
Brian Munn has replaced Anthony Galde as Swing; u/s Fiyero, Wizard, Dr. Dllamond, Witch’s Father/Ozian Official.
Heather Spore (Ensemble; u/s for Glinda) is currently on leave from the show due to shoulder injury.
Betsy Struxness has joined the show in the ensemble. In Chicago and San Francisco, she understudied Nessarose, but that is not the case as of now according to the website.
Cristy Candler (former Nessarose) is currently with the cast as Witch’s Mother; she is printed in the playbills and is performing but is not listed on the website; it is unclear how permanent this is.