- GanonSmash
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- Exalted Heroic Member
It has been confirmed a number of times that there will not be a public beta. A demo has not been confirmed or denied, but seems unlikely based on past events.
For future reference, a better place for Halo 4 questions would be the official Halo site, Halowaypoint.com, since Bungie is no longer in charge of Halo development.