Picture taking is definitely allowed. I think there was a rule about no-flash photography, but you can certainly take photos. Here are a few pics from just last month.
The audience receives pre-show instructions.
Mickey and Casey ask the audience to say the magic words
Handy Manny and Friends
Little Einsteins
My Friends Tigger and Pooh
Taken with a Canon Digital Rebel XTi at 1600 ISO. The high ISO is helpful for low-light and theater lighting.