Is "Robo 2" getting bigger and better? Earlier director Shankar has invited top Hollywood star Arnold Schwargnegger as chief guest for "I" movie audio launch. And now, he's talking with him for a silver screen feat.Reports say that talks are going on with Arnold as the Robo 2 team is planning to have him on board for the villain role. As of now, negotiations are going on, but he has not signed officially. However, nothing is final as the team has been in talks with many such biggies for the past one month for this role, say few sources.Earlier the names of indian superstars like Shahrukh Khan and Vikram are also heard to play this role. But nothing is confirmed. Already pre-production work of Robo 2 started officially sometime back.