For one brief, shining moment when I saw this ad, I had hope that this was actually going to be a new version of Egghead, Vincent Price's character from the 1966 Batman TV show. Sadly, that was not to be.
Instead, it's (sigh) Humphry Dumpler, first spotted in Dan Slott and Ryan Sook's Arkham Asylum: Living Hell. Rather than just being an it-had-to-happen use of a public domain nursery rhyme name, though, Dumpty actually has a pretty interesting gimmick that fits the source material. He's obsessed with taking things apart and putting them back together again, and while I doubt the cartoon is going to go into him dissecting and stitching up his dead grandmother (oh, 2000s comics), his obsession with machinery and his lack of knowledge about how it actually works could lead to some great set pieces.
Finally, we have the two characters in the ad that I'm actually not sure about. First, the green fellow in the center:
I've been told by others that this is a redesign for The Key, a Justice League foe that dates back to a Gardner Fox/Mike Sekowsky story in 1965. His deal was that "psycho-chemicals" gave him ten senses, plus a key-shaped laser gun and an army of robots. He's pretty complicated. Either way, his presence on the show has been confirmed, but to be honest, there's not much about this redesign that would make me think that's who he is, even with the drastic changes that other characters have seen.
If it's not the Key, then my guess -- owing to the glowing green color scheme and the metal armor-type costume -- would be that this is Dr. Phosphorus, a radioactive evildoer first apearing in Steve Englehart and Walter Simonson's Detective Comics #469. The thing is, Phosphorus was used in The Batman, so that might put him out of the running.