Just got around to reading the prologue and part 1 of volume 5 chapter 1, and I must say that right off the bat I was completely caught off-guard by EVERYTHING
First things' first- MONICA IS BACK! It looks like Quenser's childhood enemy is going to be around for awhile longer
Goddamn Kamachi and his reunion teasing tendencies
!
Secondly, I would have never guessed that the main stage this time would be a
sport festival 
I was expecting a battlefield with PMCs running around playing a support role, but it turns out to be the Olympics on high tech! The protagonist side this time is the Capitalist Corporations, hopefully this would remain the same by the end of the volume so that we'll have a protagonist side for each of the four factions.
And last but not least...
Spoiler:
Alicia Sloppyjoes
...
...
...
REALLY?! WHAT THE--!!!
?! ARE YOU F**KING KIDDING ME
?!