The Skype for Symbian application has been updated with support for Symbian Belle. The app has been available for Symbian^3 devices but now brings an updated user interface along with support for Symbian Belle devices.
While you can do most of the tasks you would on your desktop version the Skype client for Symbian Belle doesn't allow you to make video calls. No date has been revealed on when Skype's video calling feature will be enabled by reported point toward an eminent update.
source - AllAboutSymbian
source - AllAboutSymbian