Ishkur said:
Seems like Kubo is just trying to show how strong the Shinigamis are now. Now we have to wait to see what he'll do with that power.
And I also believe this arc is ending. It was supposed to be a short arc, and it has been around for almost a year. I think he's going to give the "answers" on the next arc.
With what Mayrui promised, mayuri's experiments on HM coming back into play soon and what Ishida said about SS in previous chapter, I would not be surprised if we go back to "SS is the enemy" mode for a while.
Most likely Ginjou will drop a huge bomb-revelation on what is going on to Ichigo and Ishida. Also he is most likely to survive, since he is getting a lot of attention, his own themesongs, posters in the cons, multiple color pages and chapter covers, which is unusual to say the least.
SS is awfully urgent on this matter though. They are dealing with matters they should have no interest in(FBS are not affecting flow of souls) and they are clearly not telling Ichigo everything - for example once they have started telling Ichigo about Ginjou, that person got conveniently interrupted with not-so-subtle "shut your mouth" implication form the others. Also Urahara and Isshin don't look that happy in this whole situation and for some reason stay at sidelines right now, so they might be just aligning themselves with the lesser danger and plan on doing something after SS ends this stuff.
As for Aizen - yeh, no need to freak out. Aizen is Renji's "mettle" , a goal to aspire and surpass. He might be dead or he might not even exist, the importance is that he was there.
That said Aizen will obviously be back and with how it is going and how uneasy the whole SS team right now feels to the reader and Ishida pretty much doing foreshadowing line's at SS posing danger to Ichigo, the possibility of Aizen as anti-villain/anti-hero is very high. Frankly the only way he might die is if he goes against Soul King and since Aizen is the thematically Lucifer of the setting, for his death to be the act of rebelling would be fitting, so I bet on heroic sacrifice in the endfight from him.