Possible Continuity error in the sequil

I just saw the new trailer for the movie which actully got me excited about this movie for the first time ever. There is one thing I noticed that looks majorly wrong.
The trailer starts out with Sam talking to Bumblebee about going to collage and it seems from that clip that Bumblebee still can't talk as he was back to useing the radio to exspess himself. His voice box was fixed at the end of the first movie, anyone remember this.
Bumblebee: Premittion to speak, sir.
Optimus Prime: Premittion granted.
Bumblebee: I wish to stay with the boy.
Can we just get one Transformers continuity that doesn't have any plot holes in it, please! Every Trasformers continuity error is like getting kicked in the head with a pair of spiked steel toed boots.
The trailer starts out with Sam talking to Bumblebee about going to collage and it seems from that clip that Bumblebee still can't talk as he was back to useing the radio to exspess himself. His voice box was fixed at the end of the first movie, anyone remember this.
Bumblebee: Premittion to speak, sir.
Optimus Prime: Premittion granted.
Bumblebee: I wish to stay with the boy.
Can we just get one Transformers continuity that doesn't have any plot holes in it, please! Every Trasformers continuity error is like getting kicked in the head with a pair of spiked steel toed boots.