So I've been testing wheezy on the servers at work which mostly provide CIFS shares to Active Directory clients. The upgrade went smoothly, but authentication was simply not working. Winbind however was working just fine - wbinfo -u showed users, nsswitch.conf looked good, smb.conf has some deprecated options but nothing serious, etc.
What has happened is that the debian winbind package now only provides winbindd. To get authentication work using winbind you need to install libnss-winbind and libpam-winbind. Do not start worrying about nsswitch.conf or smb.conf - they are still fine after an upgrade.
Hopefully this will save some of you some time. Though I might just be having a slow day.
edit: the package hasn't been split, but for some reason, those 2 packages were removed during dist-upgrade.
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