One of my friends was a extra in one of the TF3 scenes.
I refuses to give out the name of the person but here is some of what he told me.

My friend:
i do know galvintron is in though
Me:
...
Me:
Why.
My friend:
or whatever the fuck was attacking us
Me:
Lolz.
Me:
You were running?
My friend:
the crew said "a bigger megatron"
My friend:
i was like...oh ok

... Bigger Megatron.... o.o

 

That about sums it up.

 

Believe what you want.... But this guy is a trust able guy.

 

You know.... Whatever... I guess for now on when I find stuff out, I will keep it to my self.

 

Never mind whether they've started filming. Has it even been confirmed that the script is finished, yet?

 

When has Bay told us anything....

Past -
MEGATRON IS NOT IN TF2...!

 

Dude, the film is still in preproduction. That means no filming. Period. Also, they aren't going to be telling extras something like that! They would just say "run from the big f**k robot!"

If this isn't something you just made up for attention, then your friend is lying to you and having a good laugh at you.