I don't have a lot to add to that having read Green Lantern Corps #11. Except this. Salaak is pure, unadulterated awesome.
The jail-break action from last issue continues. As their comrades cover their escape, Earthmen Green Lanterns John Stewart and Guy Gardner - rather than fleeing the planet - instead flee deeper inside the Guardian home world of Oa. Their goal? A hidden bunker, discovered during the War Of The Green Lanterns storyline where the Guardians store their earliest experiments in creating a peace-keeping force for the universe.
As you might have guessed from the previous summary, there's a rather involved storyline leading into this issue. This is a great comic but this is a bad issue to start reading it, if you aren't already. I highly suggest you newcomers pick up Green Lantern Corps: Recharge and start from there.