The second arc of Fate/Grand Order, subtitled 'Cosmos in the Lostbelt', is incoming! After the battle within Salomon Temple, Chaldea faces another crisis where the Mages Association attempted to dismantle and restructure it, with the Rayshift technology disabled. However, an enemy strikes from within, aiming to revert humanity back to the Age of Gods.
This arc will officially begin on Summer 2018, but a Prologue (which consist of mostly dialogues and battles using just Mashu Kyrielight and Leonardo Da Vinci which are moderately easy) are available.
Confirmed New Servant
Anastasia Nikolaevna Romanova
Has appeared in the prologue
Class is Caster
Is a 5-Star Servant
Has control over ice.
As her name implies, she is the focus of the first Lostbelt
Looks very similar to Scathach, but it's not confirmed if it's just her Caster variant (she has knowledge on magic, is known as 'The Witch of Dun Scaith'). It's also possible that it's Scathach's daughter (Uathach) or sister (Aife).
It's possible that he is an alternate version of Arjuna, based on his voice, Indian design and the artist (pako)
Part of the promotional poster involve Altria Pendragon with the sheath of her sword, Avalon. The Avalon has not been featured in Fate/Grand Order in any form. This may imply that she will get a Strengthening that will let her obtain Avalon.
Lostbelt is the equivalent of Singularities in this arc. There are seven confirmed Lostbelts.
Lostbelt No. 1
Permafrost Empire: Anastasia: The Grand Duchess of a Beast Nation
April 4th 2018
Anastasia's Master is named Kadoc Zemlupus
Miyamoto Musashi may feature in the Lostbelt
Marks the debut of Atalante in her Beast/Berserk form as well as Avicebron (Caster of Black) from Fate/Apocrypha
There is an unknown identity servant with black body and red blood sharp scarf/garment.
Kirei Kotomine will feature in this Lostbelt, and much like the deal with Ishtar, Ereshkigal and Parvati, he might have turned into a demi-Servant. Speculated to be either Rasputin or Ivan the Terrible.