User blog comment:Tupka217/Christopher Jones teases new comics characters/@comment-5188108-20120828160928

Four characters, three he designed...

Grodd and Brainiac have yet to appear on the series, so it's likely he designed them. Which would mean he didn't design one of the two to come, which would likely be because that character has already appeared on the show. Of those characters we've seen Riddler, Black Manta, Captain Cold and Lex Luthor. Since issue 22's solicitation mentions Lex Luthor's secret weapon and partially takes place in Metropolis, I'd wager it's him.

It would also mean it's unlikely we're going to be seeing Black Manta, and therefore Kaldur finding out about his father and/or his "defection", in the next few issues of the comic.