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Is it going to be a downloadable demo at the marketplace???
Non-Playable Charater
Nope. No demos. You just have to buy it blindly.
Console Division Lead - Clan ParadoX
They said there wouldn't be a demo/beta in the last WU I believe.
No, Bungie rarely, if ever release demo's of their upcoming games. It increases the demand and hype by a great margin :).