Hint: It ain't Santa Claus.
Akon (?) and the 12th division staff are taken out by a Sternritter, but Akon has has done what he wanted beforehand. The portal opens in the sky and the shinigami and Quincies know that the savior Ichigo has arrived. Ichigo uses super speed to check on Rukia, Renji and Byakuya (who is not dead), and Byakuya asks Ichigo to protect Soul Society. Ichigo then goes to confront Bach.
Meh. I was hoping for someone other than Ichigo to show up just to give us a surprise. It sucked that Ichigo was stuck in a cage put up by some scrub and I wanted to see him out of there as much as the next guy, but they started mentioning about the Zero Division and the Soul King and stuff which got me hoping for something new. Obviously Ichigo had to come in and make the save eventually, but it seems a little early to put Ichigo up against the big bad unless the fight is going to get interrupted and dragged out. I guess Kubo thinks that the Zero Division or whichever other players that may be in the game will be better off showing up later.
Since his time in the cage, Ichigo seems to have been bloodied and bruised, but now he seems to have learned how to move super fast/teleportation. We'll see how he fares against Bach.