Kevin Dunn and Julie White, who have played Ron and Judy Witwicky, respectively, in the TRANSFORMERS franchise, have signed on to the third installment, reports VARIETY. Stars Shia LaBeouf, Megan Fox and director Michael Bay have already inked deals. Ehren Kruger penned the script. Lorenzo di Bonaventura and Ian Bryce are the producers. Steven Spielberg returns as exec producer. DreamWorks plans to release the film on July 1, 2011.