Here are some pictures I video captured from the Official Disneyland Podcast, which you can get for free online. They don't show an incredible amount, but there are some interesting shots, and one of a complete diorama! I'm so excited for this Wednesday, I am so there.
Maleficent a second later. This is the only moving piece which is shown.
Some people working on painting diorama pieces. Notice the black-light and glowing paint.
A servant piece being painted.
What appears to be a full diorama of burning the spinning wheels.
The diorama of the Sleeping Aurora.
Some sleeping courtiers.
Another sleeping servant.
Maleficent with her raven's wings out.