I have a pretty standard marketo nurture created, where leads receive pieces of content throughout the month. I'm trying to figure out how I can see when leads will receive their next email in my nurture, aside from trusting the "flow" logic is going to work properly.
To further complicate this, I launched the campaign, but edited my nurture (I changed the "wait" times) mid campaign.
Are you using the Engagement Nurture? You can see the Cast list on the Dashboard if you click on the name of the program. It won't show you groups by next email though.
Changing the email or cadence should not affect this.
If you mean a regular program with wait steps in a campaign, you can run a campaign performance report to see a count of leads in the wait steps. It won't show you the exact email though.