User blog comment:Thailog/New trailer for Season 2/@comment-4105479-20120420205004/@comment-1038387-20120420205958

The rights problem with Wonder Girl is, for as much as I understand:
 * 1) The name "Wonder Girl" was first used for teenage Diana.
 * 2) Donna is a magically deaged clone-ishy something of Diana.

So, who gets creator credit for "Wonder Girl"?
 * William Moulton Marston, who created Diana (leaving aside that Harry G. Peter hardly ever gets credited for this).
 * Robert Kanigher and Ross Andru, who "created" the teenage Diana in Wonder Woman (Volume 1) #105.
 * Bob Haney and Bruno Premiani, who created Donna Troy in Brave and the Bold #60.
 * John Byrne, who created Cassie Sandsmark in Wonder Woman (Volume 2) #105 (and made her Wonder Girl 6 issues later).

Beats me, we'll have to wait for the episode credits to be sure.