There is one Glinda in the cast. I think the confussion comes from this:
Mexican productions (Wicked being no exception) usually have "guest stars", i.e: actors that appear once a month or so in the show, the way some celebrities appear on special episodes of a TV series (Think of all the guest stars in the Simpsons during all seasons).
Usually, the reason for this special appearences is to cover the absence of the main lead.
For example, in Peter Pan, about 2 years ago, Lolita Cortes was the main lead in the role of Peter Pan. However, on special dates (Sunday evening, a few months after the show oppened), another famous mexican actress, Hiromi, would take her place, because Lolita had a TV show on sunday evenings.
So, "guest stars" are often used to cover planned absences of main leads, and their performances are announced as special shows, so that people now that someone different is going to play the main role. And this is also useful to attract people who saw the show before, but might find interesting to see another actor in the role... Like revisiting a show because you want to see someone else playing the role.
In the case of Wicked, it was announced that an actress named Majo Perez will be a guest star as Glinda.
This means that in some performances, they will (most likely) announce in advance that Majo Perez will be playing the role of Glinda. I have no idea for how many performances this will be the case, or how early in the run of the show this will happen, but eventually, Majo Perez will play Glinda, at least once in a while. If the exact reason for this is a planned absence of Cecilia de la Cueva, or any other, I have no further information.
@ Dame :) Glad you enjoyed.
EDIT> To make it clear, there are 2 Elphabas (Danna Paola and Ana Cecilia Anzaldua) and 1 Glinda (Cecilia de la Cueva) in the "company" and they are the three actresses who went to NY to meet the cast of Wicked and Stephen Schwartz.
Updated On: 7/19/13 at 10:39 PM