There is a report that shows what the following months potential billings could be based on current rebillings scheduled. It only shows a forecast of the the next billing round and does not take into consideration future new subscriptions or future cancellations. The report isn't exact, so it is only able to give you a rough estimate.
1. Under 'Reports' choose 'Recur Bill Predictor'
2. Click 'Show Detail' to expand the months to show the specific members who will recur