Talren Highbeacon (Argent Crusade)
Lady Liadrin (Blood Knight Matriarch)
Redemption (Liadrin's Steed)
Knight-Lord Dranarus (Blood Knight)
Thisalee Crow (Druid of the Talon)
Skylord Omnuron (Druid of the Talon)
Joanna Blueheart (Marshtide Watch Commander)
Joren Ironstock (Mountaineer Captain)
Helga Nesingwary (Pale Hunter)
Archmage Khadgar
Thrall
Vindicator Maraad
Admiral Taylor
those seem to be the confirmed ones with titles and current appearances. Others mentioned but not shown yet-
Highlord Bolvar Fordragon (?)
Genn Greymane
Mehlar Dawnblade
Hobart Grapplehammer
Deathguard Darnell
Shokia
Calder Gray
Tyri (gosa?)
will add more as they're datamined or people point any i missed. keep in mind this is just "our" Azeroths characters, not AU ones like Velen and Durotan.