It seems like people are so desperate for that list to be true, that'll they look for any reason to make it so. No matter how far fetched they are. As previously stated, her name is just Zatanna. Sorceress Zatanna is just something people came up help justify the second season leak after Sub Zero was disconfirmed by Ed Boon. I cannot think of a single time she was ever called that comic wise. Sorceress sure, but not Sorceress Zatanna.
And I'm really sick of having to repeat this. The guy who "leaked" the first list wasn't right about anything. Because he didn't leak it, he just happened to be the first to report it and he took the credit from someone that actually hacked into the files.unlike the first list, the second list doesn't have a source code, voice actors, or any other data to back it up. Dozens of experienced hackers have been through the files since then and nobody's found any evidence supporting it.
MMH, Red Hood, and Power Girl were all mentioned in an interview by Boon in regards to requested characters. This guy was probably hungry for more fame so he made up the list based on the characters mentioned in that interview. MMH did get in, but his inclusion was the most obvious one.