On Friday, June 26, 2009, Bullpen v2 was made available for all player sets under the main SOM site (namely: 2007 season and later, ATG III and later, and 1986), as the default bullpen version for all new leagues. This is an upgrade to all aspects of relief pitching, including new features giving the user greater control over his bullpen, and improved computer manager logic. Read more about it here.

All past leagues and all existing leagues as of that date used/use Bullpen v1.