Verification : confirmed
Credits: T & Aohige_Ap
Source: APforum & 2 ch

Chapter 616: Memorial Day of Revenge
Cover: Shells Town Marine base, Rika the waitress in training
(T mistakenly says she's the milk girl in Ace's coverstory, but Rika is the other girl who gave Zoro the sugar-rice ball)
On the ground near her feet is Luffy's 400 million wanted poster

There's a public accounement heard through Fishman Island.
It's a warning that dangerous individuals from Fishman district have entered inside FI
They don't look like they're coming in droves to come shopping, but hopefully nothing happens..

The border guards are unreachable.
Looks like the New Fishman Pirates brought numerous sea monsters with them, to launch an attack.
They say once they down Neptune and his three princes, the rest should be easy

Scene changes to Robin

Scene changes to Robin

She's riding a fish-bus, and heading to the Forest of Sea
Scene changes again to inside the Ryuguu Palace. The human pirates that attacked are all taken out by Zoro

Scene changes to Franky
He's already arrived at the Forest of Sea with Sunny.
He asked Tom's younger brother, a Bering Wolffish fishman Den to coat the ship.
Kokoro had sent them a letter, so Den already knows about how Tom died.

Jinbe is in front of him.

Scene changes to Ryuguu palace again
The entrance is open. Hody & Decken, and their crew all entered the palace.
Hodi used to be a very capable soldier in the army.
He thinks Shirahoshi missing is Decken's doing, and told him she's missing.
Decken gets on a coral and heads to Luffy and Shirahoshi
"Only thing separating two love birds 10 years in development is death!!
Bahohoho... if you are to be someone else's, then I'll make you bleed to death, Shirahoshiii!!"

The end of chapter
T says there's a lot of lines in the chapter, so the gist of the chapter may be hard to come across without a full script.
The battle is finally starting

T's additional info

This week's fun. Zoro and Deck/Hodi do meet and have conversation
But before Hodi/Decken took over the fort, Zoro already took out everyone.
Hodi was like "What is this, some present for me?"