The Sorcerer Essentials articles contains the following snippet:
A couple of worthwhile exceptions provide light blade-wielding sorcerers with various advantages. For example, mordant weapon at 8th level (see King of the Trollhaunt Warrens) and radiant weapon at 15th have properties that allow you to turn all damage dealt with the item into acid, poison, or radiant damage.
I fear for what shall occur should they revoke their FAQ ruling that magic weapon powers do not apply when the weapon is being used as an implement. A Githyanki Silver Weapon or a Radiant Weapon, especially as quarterstaffs for staff-users, could be used to convert the damage from Implement keyword powers into psychic damage or radiant damage respectively. We certainly do not wish to see the Psychic Lock feat or the Student of Caiphon paragon path's level 11 feature applying on every single implement power, do we now?