If you are done with her, just give her the pertinent info that she needs to know about her kids (bug bites, behavior issues, etc.) to be a good mom, other than that, nothing.
If you want her back I'd say, "(First all of the pertinent info.) And, since we are separated and you want a divorce that's all we need to discuss." It may start a discussion, but so what. You discuss how you have no desire to be her buddy through this. You are her husband and if she does not want to be your wife you can't just go being buds like nothing ever existed. You will be civil and a good dad and not stress the kids out, but you have no intention of being her best friend if she is leaving you. That's a conflict of interest. You can't go from husband to "just friends". You can be polite and civil, though.
