Electronic Arts has had a rough go of it lately due to the launch difficulties of Sim City. Today, TechCrunch reports that the company is changing its leadership at the top, with CEO John Riccitiello submitting his letter of resignation to the company and stating he will be stepping down on March 30th. Larry Probst, the current Chairman of the Board for EA and CEO of the company before Riccitiello, has been appointed Executive Chairman effective immediately. Probst will lead EA while the board searches for a permanent CEO.Filed under: