Jace, the Mind Sculptor and Stoneforge Mystic will both be banned in Standard effective July 1, 2011.
Exception: The deck list for the "War of Attrition" Event Deck will be legal in Standard if kept completely intact. That deck, which went on sale on June 10, contains two copies of Stoneforge Mystic.

On Magic Online, Jace, the Mind Sculptor and Stoneforge Mystic will both be banned in Standard as of the June 29, 2011 downtime. There will be no exceptions made for the Event Deck containing Stoneforge Mystic, as that deck will not be sold online.