There is also an article in People:
http://www.people.com/people/article/0,,20777723,00.html
Greenblatt has jokingly stated "I want Miley Cyrus" for peter. He also mentions that there will be "some kind of state-of-the-art light technology for Tinkerbell."
Of course, since Peter is "a mischievous boy who can fly and never grows up" the obvious choice would be Justin Bieber.
The Playbill article also linked to this article:
http://www.playbill.com/features/ar...sh-List-for-NBCs-Next-Live-Television-Musical
I have to say, I really like the idea of Mame starring Cher, Christine Baranski as Vera Charles, and Tina Fey as Agnes Gooch.