The Daily Blam was one of many sites that featured this fan-made poster as an "official" release by Dreamworks last week. It was made by the artist known as Seduff, and probably copied directly from the artist's blog.
Although several official images have been released, none of them include David Tennant's character, Peter Vincent, which Dreamworks seem keen to keep under wraps.
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In other unsubstantiated news, The Sun is keen to perpetuate the rumour that David Tennant is still set to star in The Hobbit