The full list for the 20th Anniversary Edition Vol. 4 is out with some very interesting reprints! Could this be a hint for future releases?

Full list of cards:
Exceeds Skull Archfiend
Elemental HERO Stratos
Eater of Millions
Supreme King Dragon Darkwurm
Archfiend Eccentrick
Number 41: Bagooska the Terribly Tired Tapir
Toadally Awesome
Rekindling
Fossil Dig
Xyz Universe

Source from OCG Official Website