Talk:2.9/@comment-60.234.95.129-20160606150347/@comment-28140789-20160607003800

If you completed her challenge twice you still can't promote her: the 2.9 update made newly occurring challenge characters once again promotable (as has been the historical norm in this game) if you obtain them through challenge; it did not make the 2.8 characters promotable even if you completed their challenge.

I don't think any future update will directly do so, not unless one puts the Dawn of Justice characters into the store as are the Man of Steel characters (which would be effectively as opposed to directly, but that's hairsplitting). If they reoccur as challege characters, then yeah, they'll probably be promotable.