Weeks ago, I heard that all new musicals (no mention of the revivals) would be "involved" and get to perform to a degree. (I interpreted this as doing a group number to open the Tonys, such as the "One Night Only" number from 2004.)
Since, we learned THE LION KING is opening and LITTLE MERMAID is doing "Part of Your World" -- so the "ensemble" number idea is out. I know YOUNG FRANKENSTEIN is performing for sure, but I still haven't heard a confirmed "yes" about A CATERED AFFAIR.
What I THINK is happening is that there is a montage of ACA/LM/YF performing back-to-back, each getting about a minute. So "Part of Your World" et al will be edited to fit the time alloted.
What I would LOVE to happen is to have this montage not just be these three shows, but all SEVEN new musicals, which would mean the new shows get to perform twice (as in the 2005 Tonys). If this is the case, I could see XANADU doing "Xanadu" + IN THE HEIGHTS doing "In The Heights" + PASSING STRANGE doing "Amsterdam" (I was told PS was doing "Amsterdam" but the Playbill article only mentions "Keys." Odd.)
"The Spectacle has, indeed, an emotional attraction of its own, but, of all the parts, it is the least artistic, and connected least with the art of poetry. For the power of Tragedy, we may be sure, is felt even apart from representation and actors. Besides, the production of spectacular effects depends more on the art of the stage machinist than on that of the poet."
--Aristotle