What do you think we can expect from Arthas?
We know Kelthuzad is in Shadowlands and that he is allegedly working for "The Banished One" aka The Jailer.
We know Saphiron was datamined as a Model/Npc.
There hints that Uther will go some process of changing into a true Kyrian in Shadowlands.
From Interviews we know that there are plans for Arthas
"Arthas is a fundamental character to the Warcraft IP and they didn't want to use him in an offhand way to cheapen his storyline."
"We want to do the right thing by him."
Kaelthas want revenge on Kelthuzad so I think Kelthuzad is going down this road being "destroyed, killed,whatever" with Kaelthas help.
Uther still has to be transformed into a "true" Kyrian forgiving Arthas?
Why Saphiron was added
What do you think they plan for Arthas?