Some previously unconfirmed cards in Premium Gold 2 have been leaked.

These cards include;

Absolute King Back Jack
Ghost Charon the Infernal Ferryman
Pero Pero Cerberus
Tristan, Knight of the Underworld
Blackwing – Nothung the Starlight
Dragocytus, Impure Dragon of the Underworld
Number 14: Greedy Sarameya
Number 21: Frozen Lady Justice
Parallel Twister
Elemental HERO Neos Alius
Debris Dragon
Grapha, Dragon Lord of Dark World
Naturia Barkion
Dark Hole
Rekindling

Source: http://ygorganization.com/