.... It'll be something entirely new. ...
only in size. Revolutionary ... please.
Now the clues are all there: the invitation, the word "creation", the event taking place in a center of arts(!).
It is a theater in SF that is not highly oversubscribed. It is also in the same complex as the convention center so has access to some media pre-production stuff. Nevermind they have done stuff like AppleTV and other events where would been too big for their on campus theater.
As for creation:
"Come see our latest creation."
If it was come see your latest creation you might have a point (or unleash your creativity , think different , etc. ) This is about what APPLE created, not what the users can/will create. Little in the invitation that contradicts that this is primarily a consumption device. Should be able to create more than using a Touch/Phone but still weighted on the consumer side.