Gearbox Software's Borderlands series has taken gamers into its space-Western, sci-fantasy looter-shooter aesthetic in a number of adventures over the last 10 years. Now, with the developer aiming to make a big splash at PAX East (starting tomorrow/Thursday afternoon), they've released a teaser trailer for what many hope will be Borderlands 3, but which is currently teased as Borderlands: Mask of Mayhem. The art style of the teaser is both exactly like you expect Borderlands to be and something new that brings the extensive cast of characters into the modern era. Longtime fans of …