By the end of 2013: Either the Iranian regime is overthrown by popular revolution, or there is an overt airstrike against Iran by either the US or Israel, or Israel is attacked by an Iranian nuclear weapon (70%).

Essentially seconding mattnewport: the price of gold reaches $3000USD, or inflation of the US dollar exceeds 12% in one year (65%).

The current lull in the increase of the speed at which CPUs perform sequential operations comes to an end, yielding a consumer CPU that performs sequential integer arithmetic operations 4x as quickly as a modern 3GHz Xeon (80%).

Android-descended smartphones outnumber iPhone-descended smartphones (60%).

The number of IMAX theaters in the US triples (40%).