Talking about OP it does have several spoilers but in comparison to all OP to date it is the least spoiler full one. It is impossible to create spoiler free OP especially when they are based on specific arc so this OP is really good in being spoiler free.
It has a bit too many static images but otherwise I find it really enterating as well as the music.
Talking about episodes... Juvia sure has pulled a short straw, there is no way Erza will let her through like Gildarts.
I liked the Miria entrance, felt bad for Evergreen and Elfman
Gildarts is real monster it is nice to see Natsu give up instead of going into power up mode as usual.
P.S. I read this arc partly so I don't know about all the events