Re: Billing order.
I think its safe to say that the 14 actors who attended the Comic-Con are the principal/main cast.
So they are the ones who would will get a billing in the posters.
X-MEN RI5E' MUTANT OF THE MONTH | NIGHTCRAWLER | PORTRAYED BY ALAN CUMMING
"Most people will never know anything beyond what they see with their own eyes?" - X2
NIGHTCRAWLER WILL RETURN IN X-MEN RI5E