You can already get this data in a zipfile of CSVs by doing an export using the action button next to a contact list

Right now contact lists show only one number for your contacts, which is the 'total' number of contacts all combined between active and inactive contacts.

Soon the contact list page will show the following information broken out under each contact list:

90 day actives

unsubscribes

bounces

complainers

inactive

total

The number currently shown on the contact list representing the 'total' number of contacts will be changed to show the number of active, mailable contacts - ie those who haven't been marked bad due to bounces/unsubscribes/complaints.