Michael Bay has announced at CinamaCon that Stanley Tucci has joined the Transformers 4 cast alongside Mark Wahlberg, Jack Reynor and Nicola Peltz. Bay also hinted that he will be announcing another actor soon as well.
Tucci is an Emmy winning actor who is recently most well known for his appearances in Captain America and The Hunger Games. He will also be in the upcoming movie, The Hunger Games: Catching Fire.
UPDATE: I can't believe I wrote Steve instead of Stanley. Well, I guess it was 6:30am and I was half asleep.