Feel free to drop any guess/prediction/any gossip in the comment section.
I'm looking forward for the incoming servants! Especially Solomon!
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Leaked servants list(datamined on 2016).
Half of them already implemented in-game now.
Fate/Stay Night, Hollow Ataraxia & Unlimited Codes:
Artoria Lancer (New)
Emiya Alter (New)
Gilgamesh Caster (New)
Medusa Devil (New)
Medusa Girl (New)
Jaguar Man (Taiga Fujimura, new)
Isthar (Rin Tohsaka, new)
Parvati (Sakura Matou, new)
Fate/Apocrypha:
Sieg
Chiron
Astolfo Saber (New)
Avicebron
Semiramis
Fate/Extra & Fate/Extra CCC:
Mother Harlot (Nero as Rider servant?, New)
Suzuka Gozen
Gawain
Vlad III
Li Shuwen (Assassin)
Meltlilith
Passionlip
Kingprotea
Kazudrop
Violet
Fate/Prototype:
Arthur Pendragon
Gilgamesh Prototype
Perseus
Perseus Lancer (New)
Fate/Grand Order (All brand new servants):
Valkyrie
Miyamoto Musashi
Caeneus
King Hassan
Sigurd
Tomoe Gozen
Qin Liangyu
Cleopatra
Holmes
Tiamat
Hyozoin Ryu
Mochizuki Chiyome
Quetzalcoatlus
Calamity Jane
Bradamante
Ivan the Terrible
Red Hare
The rest of them, when?
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