There has been confirmation of the cancellation of Green Lantern: Lost Army, Cullen Bunn's comments are below.
"Issue 6 will be the last issue of the series," Bunn tells Newsarama. "There's more to the story of these lost Lanterns, and their story will be resolved in another limited series or in the pages of another Lantern book. I developed a plan for them, and I hope to be part of how it plays out."
JUSTICE LEAGUE: GODS AND MEN – GREEN LANTERN #1
Written by TOM KING
Art by EVAN “DOC” SHANER
Cover by FRANCIS MANAPUL
ADVANCE SOLICIT • ONE-SHOT • On sale NOVEMBER 4 • 32 pg, FC, $3.99 US • RATED T
With the Green Lantern Corps threatened by a strange extinction-level event on Oa, only Hal Jordan and John Stewart remain to save the Corps-—and themselves—from joining Darkseid’s army forever!
*WARNING POSSIBLE SPOILERS*