I think it is safe to assume they will be broadcasting the performances that were transmitted to theatres - if so, this is the casting:
Metropolitan Opera House
October 9, 2010 Matinee, HD Transmission
DAS RHEINGOLD{158}
Wagner-Wagner
Wotan...................Bryn Terfel
Fricka..................Stephanie Blythe
Alberich................Eric Owens
Loge....................Richard Croft
Erda....................Patricia Bardon
Fasolt..................Franz-Josef Selig
Fafner..................Hans-Peter König
Freia...................Wendy Bryn Harmer
Froh....................Adam Diegel
Donner..................Dwayne Croft
Mime....................Gerhard Siegel
Woglinde................Lisette Oropesa
Wellgunde...............Jennifer Johnson Cano
Flosshilde..............Tamara Mumford
Conductor...............James Levine
Metropolitan Opera House
May 14, 2011 Matinee, HD Transmission/Simulcast
DIE WALKÜRE {529}
Richard Wagner—Richard Wagner
Brünnhilde..............Deborah Voigt
Siegmund................Jonas Kaufmann
Sieglinde...............Eva-Maria Westbroek
Wotan...................Bryn Terfel
Fricka..................Stephanie Blythe
Hunding.................Hans-Peter König
Gerhilde................Kelly Cae Hogan
Grimgerde...............Mary Ann McCormick
Helmwige................Molly Fillmore
Ortlinde................Wendy Bryn Harmer
Rossweisse..............Lindsay Ammann
Schwertleite............Mary Phillips
Siegrune................Eve Gigliotti
Waltraute...............Marjorie Elinor Dix
Conductor...............James Levine
November 5, 2011 Matinee, HD Transmission
SIEGFRIED {258}
Richard Wagner—Richard Wagner
Siegfried...............Jay Hunter Morris
Brünnhilde..............Deborah Voigt
Wanderer................Bryn Terfel
Erda....................Patricia Bardon
Mime....................Gerhard Siegel
Alberich................Eric Owens
Fafner..................Hans-Peter König
Forest Bird.............Mojca Erdmann
Stage Horn Solo: Erik Ralske
Conductor...............Fabio Luisi
Metropolitan Opera House
February 11, 2012 Matinee, HD Transmission/Simulcast
GÖTTERDÄMMERUNG {229}
Richard Wagner-Richard Wagner
Brünnhilde..............Deborah Voigt
Siegfried...............Jay Hunter Morris
Gunther.................Iain Paterson
Gutrune.................Wendy Bryn Harmer
Hagen...................Hans-Peter König
Waltraute...............Waltraud Meier
Alberich................Eric Owens
First Norn..............Maria Radner
Second Norn.............Elizabeth Bishop
Third Norn..............Heidi Melton
Woglinde................Erin Morley
Wellgunde...............Jennifer Johnson Cano
Flosshilde..............Tamara Mumford
Stage Horn solo: Erik Ralske
Conductor...............Fabio Luisi
Thanks, I was hoping for more names that I recognize.