DC's The Source blog has posted a teaser for an upcoming crossover called "War of the Green Lanterns," which will kick off next March.
"From Rebirth to Sinestro Corps to Blackest Night, Hal Jordan, Guy Gardner, John Stewart and Kyle Rayner have stood by each other and fought together to save our universe," said Green Lantern writer Geoff Johns. "After all that, what could possibly tear them apart? We’ll find out in War of the Green Lanterns starting in March’s War of the Green Lanterns #1 and throughout the Green Lantern titles in March, April and May. Every Green Lantern is about to be tested — and tested against one another."
As noted in the solicitations that came out today, Green Lantern #63 and Green Lantern: Emerald Warriors #7 serve as preludes to the crossover.