I'd be willing to bet that it will be some half-truth's to begin preparing you. Might cop to being "just friends" with someone, but even THAT will be prefaced by some re-writing of marital history that she, in fact, "emotionally checked out of the marriage a long, long time ago."
I could be wrong, but that would be pretty script.
WHATEVER it is, just validate (not the same as "agree"), and don't make any decisions. If it's something heavy, you may not want to even RESPOND until you've run it by some folks here.