I got this in a email.
"Jump in line at the Princess Theatre this Monday 9 January for $20 tickets to the FIRST Australian performance of the Book of Mormon (Tuesday 17 January 7PM). The box office opens at 10am, but arrive early or you'll only have yourself to blame"
Normally tickets range from $50.80 to $200+ + booking fees.
More information from the email I got:
Tickets are only available from the box office. Only 2 tickets may be purchased per person. Valid ID must be shown. Tickets cannot be resold and ID, matching the name on the ticket, will be required on entry to theatre on evening of performance. Tickets are subject to availability and will be strictly sold on a first-in best dressed basis.
They moved some people at the front of the line into the theatre and consolidated the line.