It will happen in TF2, I garentee (sp?) it. Micheal Bay seems like the guy to really push something to it's limits; the reason why Micheal didn't have many unique robots or even more than 13 of them is 'cause he wasn't into it as much. But it's sort of at first doing something you would hate but never tried it, and then when halfway through it you go, "Wait a sec, this is cool!". It's exactly what Mikey did. So he will most likely have Cybertronians with four arms, Blitzwing style faces, triple changers, maybe another version of Scorponok, a never-before-seen robot, and an old geeser-bot with a cane that becomes a energon staff.
THE HARDCORE 80'S TF FANS WILL LOVE IT EVEN MORE THAN THEY ABSOLUTELY ADORED THE FIRST ONE!
...let alone loving Micheal Bay himself...
I can see him now at the first meeting for the final script:
"Okay, so let's start things off AWESOME"