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So, with three dayes to go, BioWare has anounced the bonus character for Dragon Age 2 in the Signature Edition is The Exiled Prince, Sebastian Veil. If you miss out on the free upgrade, The Exiled Prince will be available as paid DLC after January 11th (the free upgrade deadline). From the Dragon Age 2 page:
More information.Adventure alongside Sebastian Vael, an archer of noble birth, as he seeks revenge for the brutal murder of his family. Aid him in his quest, and direct his righteous wrath on your enemies. This character is included in the Dragon Age II Signature Edition at no additional cost, or as paid DLC after January 11.