I dont want to ruin the surprise for november but it would be great to have a demo. You would NEVER get bored because you can play it again, and again and again! Searching for every last drop of goodness. Perhaps it would be cool for bungie to give OXM an old build of last years E3 so that the games much different by november, I would play it every day until november 9th. Perhaps bungie should place some eggs in the demo also carefully hidden for us fans to find :D
But like I said, demo spoils it...