I doubt Vixen and Hawkgirl soon since CW is using them and neither is actually that important to be shown so soon, Zatanna will likely only appear in JL Dark,
The fact that Barry Allen is being used in the movie and the television series(which in turn acknowledges the multiverse anyways) refutes all this. There isnt any reason why they cannot use these characters in the Justice League film.
When there's no more room in Hollywood, remakes shall walk the Earth.

Mera is already in it at times. I would like Zatanna
http://www.aznude.com/mrskin/stephaniehunt/somebodyuptherelikesme/somebodyme-hunt-0001-hi.html
first then she could go on into the Jld movie. Black Canary can do JL2 then the Birds of Prey.

Technically
Hawkgirl
belongs to the
Justice Society
which is in
Earth-2
Either,
Black Canary
,
Mera
or
Oracle
are the best candidates really.

Oracle is guaranteed.
I doubt Vixen and Hawkgirl soon since CW is using them and neither is actually that important to be shown so soon, Zatanna will likely only appear in JL Dark, Black Canary is likely and there has been many rumors of her appearing, we saw Doomsday rumors become true so i wouldn't be surprised if she appears.
"I feel you, pretty baby, feel me
Turn it up hot, lovin' you is free"

I hope they say Said in Wonder Woman is playing Zatara. But I think who they would get for Zatanna would be new enough that putting her in these in small area till gets to the JLD movie would be low dollar.

Black Canary - This one is my personal favorite, for no particular reason
Vixen - is being hyped up on one of the YV shows and in a new comic, so maybe that means something(?)
Zatanna - Would probably be better for the rumored Justice League DARK, but she's good too.

Black Canary
or
Mera
would be the best candidates, if there were to add another woman to balance the team a bit.

This message has been deleted.

My opinion's definitely the unpopular one here, but Jessica Cruz is quickly becoming my favourite Green lantern, and I think it would be extremely cool to be able to see her on screen.
I like her toobut her backstory is WAAAAAAYYYYY too complex to just introduce her cold. They would have to re-invent her from the ground up, and that would lose a lot of what makes her interesting.

I'd personally love to see either Hawkgirl or Jessica Cruz be added as a member to the Justice League.
My opinion's definitely the unpopular one here, but Jessica Cruz is quickly becoming my favourite Green lantern, and I think it would be extremely cool to be able to see her on screen.

Vixen, Hawkgirl or Zatanna would be great for this.
When there's no more room in Hollywood, remakes shall walk the Earth.

They are making Justice League Dark so there is high possibility that Zatanna will be next
Too many dicks in JLand one robot dick poor Cyborg
Not that I have problem with Justice League dicksthat would be one hell of a group sex

I would like to see hawk girl , I really liked her in Justice league cartoon.
I guess stupidity is your boards signature.

That's what I was thinking, but I can't tell for sure didn't want to run with an assumption.
End Transmission: Code 350

It has to be Mera.
We haven't heard of any other super powered characters, I think there has been talk of Amber being Blonde and not Redhead

So there's now a 'sizzle reel' out of behind-the-scenes footage.
at around time 0:49 there's a scene of Gal and a blonde woman. They don't appear to be in costume. It looks like they're practicing a physical stunt of catching something large on their shoulders together.
Any way not sure who that blonde woman is. Can't tell if that's Amber Heard as Mera or not.
End Transmission: Code 350

If anyone
deserves
it, it's Dinah.
But they will probably add Oracle or Zatanna first.

I definitely understand. And I think Oracle should have been in BvS as well.
My issue is waiting for new casting and the introduction of newer characters.
Zatanna just shows up? That really didn't work with Cyborg.
Shoehorning characters as iconic as DC's isn't a good thing to do.
I just figure they go with what they have. Harley can just be forced by Waller or Batman can get his hands on her device.

Harley is a villain
I have not been a fan of them slowly making her more of a "Good guy" over the past few years. Putting her on the Squad is about as good as she should go.

Add Maxima from Supergirl.
Man that's good casting.
But what about Harley?

Figured Lois Lane was the 2nd other woman in JUSTICE LEAGUE even though she isnt a superhero and just a human-journalist, makes sense as she was there in the end with Batman V Superman conflict and he's death as shared and witnessed by Lois with both Bruce Wayne/Batman & Diana Prince/Wonder Woman
Maybe there shall be another Female version from the Super-hero basket of lists but try to remember Lois Lane is in her own right a Rebel supporting the superhero's Justice League but figure further female SuperHeroines like Wonder Woman shall appear or pop-out sooner or later.
Nothing is as it seems, nothing is just one thing and nothing is ever just over there;

Vixen: interesting and different power set. Black Canary would be accused of being a Black Widow knockoff. Zatanna will likely be in Justice League Dark.

With the talk about Wonder Woman being not big enough and not enough chest from people. I don't think they will cast a support role to someone that people fancast for Wonder Woman.Plus maybe a small in this plus a part in JLD they won't want someone that will hold them up for a bunch of money.And they would want someone who likes to go out and meet people and promote the movie.

Well Said has not been confirmed as her father,I will stick to my picks not some thin chick,if you want a nonwhite actress fine just suggest somebody that's not thin