Ok, first of all we all agree this is one of the best chapters so far...Out of a boom Mashima surprised us yet again and put everything we actually wanted to see in 1 chapter, thus speeding the flow of the story immensely...we have the revelation of the hooded girl in front of Natsu inc. :
My best guess considering everything would be something (I think) no one mentioned till now:
what if the hooded girl is actually princess Hisui's mother? The princess is similar to Lucy, and she doesn't have the willpower to be the mastermind as we saw it. We also have no information bout the queen whatsoever, and we saw a statue of a woman.
Also, we have a threesome between Minerva, Kagura and Erza:
While this is the most difficult thing to predict, I think this is what's gonna happen...
Jellal will interfere somewhere in the fight and drag Kagura out of it, because I don't see her losing and I don't see either Erza losing. Minerva is the sure one to go down. Or Kagura will withdraw by her own will, thinking about the fact why FT has been hiding Jellal. I am also interested whether there will be a conversation about it, though I think Kagura won't initiate it.
I know I'm underestimating Minerva, much more now that she's made such an entrance, but I think there's too little information about her motivation, so she's a highly unpredictable character, and we don't know her limits yet. Maybe she's aiming at manipulating the situation and getting rid of all of three of them, while she put the 'leader' mark on Sting's feelings, therefore removing 2 large obstacles in the way of ST's victory...that would seem a nice strategy, though I doubt it.
Ahh, this chapter is heaven.
(Also, cute Mavis. Cute.)
EDIT: Forgot about Juvia. While Mavis was a douche to tell it was only to buy time, I think Juvia vs. Shelia is actually a great choice, and I thought about it already. Shelia is strong as hell, yet we can't pair her really up with the remaining big-shots. This is a great opportunity for Juvia to get her screen-time finally, though someone in FT mentioned it's nearly impossible to defeat Shelia since she can heal herself. Well, I'm interested in what Juvia can show us :)