Geoff Johns posted over on the DC's The Source blog a brief snippet about the upcoming War of the Green Lanterns storyline/event that will crossover between all three titles starting in March of 2011 and run for three months. Johns mentions that the story will kick off in War of the Green Lanterns, issue 1, in March, suggesting that running concurrent to the events of the three Green Lantern titles will be a three issue miniseries.
Events are ramping up for the upcoming story with DC's February solicitations for the Green Lantern titles mentioning that they are preludes to the war. As Johns says, "every Green Lantern is about to be tested — and tested against one another."
Souce: DC Comics