Type-Moon released the character designs for Fate:Lost Einherjar – Aslaug of the Aurora. The physical version of Volume 1 came out in December 2022, and the digital version came out on January 20, 2023. Fate:Lost Einherjar takes place ten years after Fate/Apocrypha. [Thanks, KaroshiMyriad!]
You can check out the character designs on the official Fate:Lost Einherjar website as well. In total, there are eight characters that you can look at. In order, they are Archer, Berserker, Lemina Eltfromm, Lancer (Percival), Gagam and Memel, Bragi, Lagertha, and Rider (Sinfjötli).
As mentioned earlier, Lost Einherjar is a sequel of sorts to Fate/Apocrypha. Like Apocrypha, the Grail War system is unique in that pairs of Servants fight in duos. Lemina, who hails from the former Yggdmillennia family, is the Master of Aslaug (Archer) and Ragnar (Berserker).
Fate:Lost Einherjar draws heavily from Norse mythology. It takes place in Norway as well. Shirow Miwa, who is the character designer and illustrator, had designed Brynhildr and Sigurd for Fate/Grand Order. The author, Hikaru Sakurai, has also previously worked on Fate properties. In particular, she worked on Fate/Grand Order, Fate/EXTELLA, and Fate/Prototype: Fragments of Sky Silver.
Fate/Lost Einherjar is available in both physical and digital formats. It is unclear if an official English translation of the novels will appear in the future.