LaBeouf originally joined the film in 2010, but had to drop out due to Optimus Prime-related scheduling conflicts. After that, Zac Efron was briefly attached to the role, before LaBeouf circled back.
Shia has been making non-acting headlines recently, first for his quotes in Details, where he discussed hooking up with his "Transformers" co-star Megan Fox, then for getting in a bar fight while shooting "The Company You Keep" in Vancouver.
The star has seemingly shifted away from big-budget blockbusters with his recent run of acting roles. "The Company You Keep" comes from director Robert Redford and features an all-star cast (LaBeouf will play a young journalist in the film), while "The Wettest County" is director John Hillcoat's moody follow-up to "The Road." In that film, LaBeouf co-stars opposite Tom Hardy, Gary Oldman and Mia Wasikowska as a bootlegger.
"The Necessary Death Of Charlie Countryman," which will presumably not have Megan Fox starring as Shia's love interest, has no release date at this time.