You know when you go to a movie and they show the previews under the heading "Coming Soon?" They could just as well say forthcoming, because it means the same thing. Only who would want to see that stuffy movie?
"Forthcoming with" means "providing" — hopefully your neighbors are forthcoming with candy on Halloween, so you can fill up your bag. Sometimes parents complain that their teenagers are not forthcoming with information about their life at school. When someone is forthcoming, they are open and honest about what they're saying and they do it in a willing and friendly way.
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