Didn't they say Golden Lion is the leader of the 51 pirate crews? So, I assume it will essentially be about him, but what comes to his escape, it could be kind of tricky because I doubt they really want to show more of Impel Down than what Luffy's scenes have shown so far. I don't know how far the manga is, maybe it already has left Impel Down behind, but that could be another concern if the manga is still stuck in there.

This filler arc makes it look like that when people recognize a pirate crew to be Straw hats, all worries and fears are gone - despite the massive bounties present. It's of course more or less true, unless it's an island already lacking food.