During Blackest Night, the Black Lanterns were on the verge of winning by taking over the greatest heroes in the universe, until the white Lantern entity appeared, giving them the power needed to defeat the Necron,
Later In Brightest Day, a SwampThing was corrupted by nekron and was threatening earth, so Alec (the man whose memories had passed on to swampthing) was resurrected as the new swampthing to combat it, but he was also made into the new White Entity as the old one was dying.
A Guardian sent rings from various corps to Kyle in order to have him channel all the emotions of the various crops. The first attempt didn't last long, all but his green ring was destroyed by the partial transformation, except the orange ring which turned out to be a living construct. The transformation left his ring charged with residual powers of the other emotions though. After a lot of training Kyle learned how to use all the powers of the colored Lantern Corps and has finally reached white Lantern status.
I'm wondering if we well see Swamp-thing associated with the White Lantern Entity again? Any thoughts.