That would be sweet but we already have a Knockout in the Bayverse. http://tfwiki.net/wiki/Knock_Out_(ROTF)
People try saying that all the time and the answers always the same, the expanded universe frankly doesn't mean shit to Hasbro and Bay so anything could happen.
Knock Out's one of my favorite TF: Prime characters. The movie could actually pull off something great with that personality for the guy, but I doubt they would. Not that they can't-I still stand by Sentinel Prime as evidence that the films CAN do something good if they try-just that in all likelihood, if Knock Out does show up in TF4, he'll just be another stock villain. He won't talk, maybe just grunt menacingly, and then Optimus will shoot his face. Oh well.
This! I would love to see Sunstreaker! I know I'm gonna be disappointed, but I really want to.see Sunny!
knockout is possible hasbro has stated on record they know how popular knockout is and he has gotten more merchandise because of this
At this point, Sunstreaker in any form would satisfy me. Well, as long as he keeps his audio fins, I'll be okay.