It's been known for a while that when the Autobots return in "Transformers 4," they'll be accompanying some new faces. We just didn't know how new.

Michael Bay took to his own website to confirm the rumors from late in December. Jack Reynor, the young Irish actor previously reported as testing for the male co-lead opposite Mark Wahlberg, has won the coveted role.

"I just hired a great new actor for Transformers 4 to star against Mark Wahlberg," Bay wrote on his site. "Jack Reynor, he is an Irish kid that came to America with 30 bucks in his pocket. Pretty ballsy. Seriously who does that? Anyway I spotted him in a great little Irish movie WHAT RICHARD DID. This kid is the real deal."

Reynor beat out a relatively large pool of young Hollywood talent, including Hunter Parrish from "Weeds," Luke Grimes, Landon Liboiron, and the Australian actor Brenton Thwaites, all of whom tested for Bay toward the end of last year.

Bay then took a chance to clarify some plot details he's seen "floating around on the net."

"This movie takes place exactly 4 years after the war in Chicago ['Transformers: Dark of the Moon']. The story makes a very natural transition, and reason as to why we have a whole new cast," he wrote. "This 'Transformers' will feel very different then the last three. We are embarking on a new trilogy."

Prior to filming, Reynor better steel himself, since his role is the boyfriend of Wahlberg's on-screen daughter and a race car driver. The female part, which was also testing a host of young actresses, has yet to be cast.

Bay's next film, "Pain and Gain," also starring Mark Wahlberg, is scheduled to hit theaters on April 26. "Transformers 4" is currently slated for a June 2014 bow.