This is a tentative list, provided to me months ago by a somebody in the biz... As they say, take it with a grain of salt...(Who is "they"? why do they say that anyways??)

No idea on rarity or what may be a chase, just a list of characters...

Aquaman
Batman
Black Canary
Bouncing Boy
Bulleteer
Captain Marvel, Jr.
Creeper
Crimson Fox
Doctor Light
Firehawk
Firestorm
Green Arrow
...

Zarathos