Backup and restore
This functionality is incomplete. If we compare it with Android's Titanium Backup application, which backups from any Android device and restore (on any other Android device) with settings/configuratins and data and sync it on the cloud (Dropbox and Google Drive), the backup and restore in Windows Phone 8 is very basic (only provides pictures, videos, text-messages etc). Please provide us this feature so we can backup & restore the all or individual apps on multiple devices with setting and app-data.
Backup + restore continues to improve on the Windows platform. With 8.1, most of the settings and capabilities are now part of the backup.
As well, developers can now make use of the App Data to store app data in the cloud (for backup purposes as well as flowing information across phone, tablet, PC, and Xbox) as well as the Credential Locker (for storing sensitive data in a secure and encrypted fashion).
Trooper - can you revise this to be more developer/API focused? (see my very recent comment to the suggestion you linked to).
....and email accounts configuration. So you don't need to setup all your email accounts everytime you change your devices.