When I was reading the chapter and saw Erza fighting I knew someone would bring up the 'panties' for so far you can call it that. This comments of the people who didn't even notice it also proves what I've been saying all along: that the argument of fanservice many FT haters keep bringing up is in fact pulled out of proportion and that in fact the ones who complain the most about it, are the ones who focus the most it and seem to want it the most. In reality if you just focus on the story many of it would be subconsciously ignored.
First I was considering Gildartz or Igneel approaching rapidly; but when I saw their faces the only remaining possibility was Acnologia. It was a nice surprise though that right after we still got a panel of Igneel. The vibe he gives off when he makes an appearance is each time different.
I hope that this time there is some additional plot twist involving Acnologia or otherwise it would be just a repetition of the Grimoire Heart arc. I got the weird image in my head of Acnologia chewing on some Magic Pulse Bombs like chewing gum
It's nothing new, each has had the ability for a long time now to choose the default setting (white) or the nightfall one (black).