1. The Red Lanterns are basically immune to the Black Lantern's preferred attack (i.e. ripping the still-beating heart of an enemy out and feasting on their emotion) since their rings have actively taken over the job of keeping them going.
2. The fight between Sinestro and the Black Lantern of his wife. I don't usually cater to attempts to change villains into tragic anti-heroes, but in Sinestro's case... it actually works.
We even get an answer to that age-old question as to whether Sinestro is his first name or last. It turns out that it is his last name and that his first name perfectly fits within the tradition of alien spellings of appropriate words. His full name is Thall (Fall) Sinestro.
3. It is pretty much confirmed that the special ability of the Indigo Tribe is that their staffs can replicate the effect of any other ring type but they can only do it for a limited amount of time and there seems to be some need for proximity or prior exposure.
4. Hal standing up to Sinestro's attempts to take charge of the current situation.
5. John Stewart exploring the resurrected world of Xanshi - a planet whose destruction he failed to stop.
6. Larfleeze, a.k.a. Agent Orange, fleeing in terror before the Black Lanterns formed of all of his victims... only to run into a very angry Red Lantern Leader, Atrocitus
For the most part, I loved this whole issue. Still, I wish there was more page space being devoted to John Stewart dealing with his hubris and less time being spent on upon Hal and The Rainbow Coalition. I hope the next issue will give us more of a focus on John.