a new class is a flagship feature of an expansion. There will be no new classes. How do I know? history of the expansions.
new races and classes are always the selling points. EVEN when they don’t deliver them for a long time. Source? Zandalari trolls. Advertised as a main selling point of Battle for azeroth. We did not get them almost a year and half after launch.
No new classes. It is wishful thinking and honestly a short story is not evidence for anything. It is silly to think so.