TF4 Back to Film in Chicago?

They will proabably film there, but its not gonna be like a whole month of filming with big scenes. Proabably just little areas and the scenes will proably be a dead Decepticon coming back alive.

Maybe they're doing flashbacks of the Chicago battle from the perspective of the new characters. There were probably many little stories of survival going on besides just the fights we saw highlighted in DotM. The new characters could've been there all along, getting involved in different ways that then inform their story in TF4.

Only if there happens to be a Chicago in California. Otherwise, don't hold your breath...

That would be pretty awesome. We didn't see how the Autobots were taken hostage, - we didn't see much of Soundwave at all, and I reckon Welker would be up for Soundwave's or Shockwave's voice again.
Or, as you said, new characters - more likely to be protoforms at that point, some of which must have escaped. There's no way in hell all of the Cons were killed.

oh no.

I was thinking more of the new human characters. That Wahlberg's character might've been living in the city when the Decepticons attacked it. Since you've mentioned protoforms though, maybe he somehow ends up with a protoform and raises it as his own child when it tries to mimic a human baby while laying helpless in the rubble (perhaps his real child got killed in the attack). Would be a freaky twist if his teenaged daughter we've been following the whole movie is revealed later to actually be a Transformer Pretender. And she might not even know it because maybe the protoform had a damaged head from the city attack and forgot it was a Cybertronian. She's compelled to seek out Transformers even though her 'father' is always trying to dissuade her and that's how she eventually gets involved in the TF war.

It would certainly get around complaints of TF never being the main characters in their own movie and humans getting all the screentime. In this instance the main human character IS a Transformer.

Some flashbacks would make sense - probably what happened the night of the massacre, memories held by Wahlberg's character or something - that sort of thing wouldn't fade away with time.

Or maybe just a memorial scene to pay tribute to those humans who lost their lives in the war. Something like that.

So basically live-action version of Sari?

I'm okay with that.

We'll tackle The Appendix first: The Tyrest Accord.

I saw just enough of him right before Bumblebee blew his head clean off.

I am sure they will recap, he does love that city so its not a horrible idea