>>3083303I checked around for what happened to him in the screenplay version and found this instead from it:
"GRAVES gently, almost seductively, moves his thumb across the cuts, healing them instantly. CREDENCE stares...
GRAVES seems to make a decision. He puts on an earnest, trustworthy expression as, from his pocket, he produces a chain bearing the symbol of the Deathly Hallows.
GRAVES: I want you to have this, Credence. I would trust very few with it -
GRAVES moves close, placing the chain around CREDENCE's neck as he whispers.
GRAVES: Very few.
GRAVES places his hands on either side of CREDENCE's neck, drawing him in, his speech quiet, intimate.
GRAVES: ...but you - you're different.
CREDENCE is unsure, both nervous of and attracted by GRAVE's behaviour...
GRAVES moves even closer to CREDENCE, his face inches from the boy's neck - the effect is both alluring and threatening - as he whispers.
GRAVES: Do this and you will be honoured among wizards. For ever.
GRAVES pulls CREDENCE into a hug which, with his hand on CREDENCE's neck, seems more controlling than affectionate. CREDENCE, overwhelmed by the seeming affection, closes his eyes and relaxes slightly."
Credence at least will be back, confirmed by David Heyman. Percival though? I'm hoping he's hidden away some where and he'll be back as well.