Weekly Events

What I would love to see added would be a weekly events system in place, where every other week or so an event becomes active that could also introduce some new game modes other than the standard campaign to the game for example a survival mode where you must survive for 15 minutes on a random level as non stop hordes of undead must try to defeat you, the mission would be accustomed to your teams overall gear / power level so it is fair for each member and every 3 minutes survived each player would gain a personal buff ( speed boost, attack damage, attack speed ) whilst each round becomes increasingly harder to survive. Rewards can vary from each event to the next also adding some new exclusive items that can only be obtained through completing events.