…but the announcement of the show as far as I was concerned was that Bungie would be shipping the game with a fully-featured “demo editor”. An editor they used to create the gameplay movie shown at E3 itself, no less.
This is news to us… noone else at E3 has reported this fact (although Doug Zartman said in an October chat at World Without Borders that Bungie planned to release tools… but plans can change). In any case, the Machinima.com article is quite a good read… go check it out!