Loved this. Probably my favourite issue in this entire run.
Key things that happened:
John is fighting Esak and trying to contain the energy that was released last issue.
While fighting John is having visions of various possible futures. From my understanding this is how GL Future State stories are rolled into this run. If it contradicts something that we saw in the ongoing? Then just assume that they were one of the possible branches that John experienced.
Lonar urges John to make a choice, to select his Future State. Supposedly he has to do that to contain the released energy.
John makes a choice (I think its not clear what he picked at the moment) and sees that shit is going bad on Oa.
It is not clear at the moment how, but Guardians are back. One of them reveals that she was tracking what our evil Guardian was doing and thats why John was sent to dark sectors (to make him "invisible") and that she created Jo's ring. Basically she knew that something was going to happen, but wasn't sure what so she was preparing multiple contingency plans.
Evil Guardian is too strong even for Guardians + Jo + former GL in mecha armors + UP forces present on the planet.
Last page Hal returns with Naomi, Flash (Wally?), Hippolyta and Manhunter.
Supposedly Jo was checking in with Hal regularly and once she didn't check in for certain amount of time Hal figured that something bad happened and he has to act.