Newsarama has a five-page preview to Final Crisis: Rage of the Red Lanterns.
From their site:
The prelude to "The Blackest Night" begins here! They come from a place of great anger and hatred. They are the Red Lanterns and they will have their revenge against the greatest Green Lantern - Sinestro. That is, unless the Guardians have theirs first.
Looks pretty intense. Check it out