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Check out these Mirrodin Besieged visual spoilers:
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All appropriate Standard format Daily Events, Premier Events, Weekend Challenges, and Queues will switch to Scars of Mirrodin prize payouts after the scheduled downtime on Wednesday, October 20.
Scars of Mirrodin Release Events begin after the downtime Wednesday, October 20 and will consist of 5 parts:
Artifact Creature - Wurm
Deathtouch, Lifelink
When Wurmcoil Engine is put into a graveyard from the battlefield, put a 3/3 colorless Wurm artifact creature token with deathtouch and a 3/3 colorless Wurm artifact creature token with lifelink onto the battlefield.