A single Preview Crate: Nightfall was available to players who pre-ordered Greymoor. Unlike regular Nightfall crates, the Preview Crate does not contain random rewards. They can be distinguished from regular Gloomspore crates by their blue and grey color, as opposed to the usual red.
Notably, these crates are guaranteed to grant a Duskfire Nectar Bat pet, as well as the Hircine's Hunt head and body marking.
The rewards are as follows, grouped by rarity with Legendary rewards being the rarest:
Duplicate Legendary rewards grant from extraction.33