Re: Billing order.
I think Lawrence comes just behind McAvoy & Fassbender, not that she isn't a bigger name, just that her character here is less central to the plot than theirs. I can understand when the likes of Iron Man & Wolverine are given top billing for commercial reasons ahead of Cap & Cyclops but those characters are in the same league as the leaders. This would be like Black Widow or Hawkeye taking top billing in Avengers, however big the star playing the role.
That said this is going to have one of best huge casts for any film. So much to live up to!
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X-MEN - AVENGERS - JUSTICE LEAGUE