What does A New Plague reward?

A New Plague gives Apprentice Sash outright.

Where does A New Plague start?

It was picked up in Tirisfal Glades.

Its level has not been recorded yet; it shows once a player accepts it with the addon running.

No. The quest exists in Classic Era as well.

World of Warcraft: Forever · quest

A quest in World of Warcraft: Forever in Tirisfal Glades. Recorded by 2 players running the addon.

Level, giver, pay and objectives show once a player with the addon accepts the quest.

Item	Given	Item level	Vendor sell
Apprentice Sash	outright	12	44c

What does A New Plague reward?: A New Plague gives Apprentice Sash outright.
Where does A New Plague start?: It was picked up in Tirisfal Glades.
What level is A New Plague?: Its level has not been recorded yet; it shows once a player accepts it with the addon running.
Is A New Plague new in WoW Forever?: No. The quest exists in Classic Era as well.

Source: what players running the addon saw in the quest windows; the quest text itself stays in the game. Every quest seen · Tirisfal Glades