LONDON  - The British Academy of Film and Television Arts unveiled an all-male shortlist for its 2012 Rising Star Award on Wednesday, including “Thor” actors Chris Hemsworth and Tom Hiddleston. Previous winners of the annual prize, which honors up-and-coming acting talent and is sponsored by the Orange telecoms group, include Kristen Stewart, Shia LaBeouf and Eva Green. Australian Hemsworth, 28, shot to fame when he appeared in the title role of Thor, a box office hit last year directed by Kenneth Branagh. Upcoming projects for 2012 include “The Avengers” and “Snow White and the Huntsman” playing opposite Charlize Theron and Stewart. For Briton Hiddleston, Thor also proved his big-screen breakthrough after establishing himself as a respected theatre actor.