Coming from GamerBytes, looks like one of Gearbox's level designers spilled the beans about some character on their XBLA title was "rigged" and that he was incredibly happy about it. Looks like Twitter spills the beans again.
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That's what has happened with one of Gearbox's level designers, who via Twitter casually mentioned that a fellow Gearbox developer showed him "Our XBLA character rigged" and that it made him "incredibly happy". In earlier tweets this designer also asked which Xbox Live Arcade games his followers played, and for what reasons.
Gearbox are currently hard at work on developing Aliens: Colonial Marines as well as new content for their recent release Borderlands. They also mention 3 mystery projects on their website, in which we assume this is one of them.