The United States Patent and Trademark Office shows a trademark registration for the term "Shift" that was recently filed by Gearbox Software (thanks Kristian). From the looks of it, this is not for a game title, but rather a distribution network, with the implication that the developer is planning its own service in the style of Valve's Steam. Here's the description:
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Chatbear v1.4.0/blue++: Page generated 22 December 2014, 12:19.