What does The Sparklematic 5200! reward?

The Sparklematic 5200! gives Sparklematic-Wrapped Box outright, 2,450 experience.

Where does The Sparklematic 5200! start?

It was picked up in Gnomeregan.

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 Gnomeregan. Recorded by 16 players running the addon.

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

Item	Given	Item level	Vendor sell
Sparklematic-Wrapped Box	outright	1	12c

What does The Sparklematic 5200! reward?: The Sparklematic 5200! gives Sparklematic-Wrapped Box outright, 2,450 experience.
Where does The Sparklematic 5200! start?: It was picked up in Gnomeregan.
What level is The Sparklematic 5200!?: Its level has not been recorded yet; it shows once a player accepts it with the addon running.
Is The Sparklematic 5200! 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