I don't think this album will be out. Ever.
It has already changed from a "best of" to a rerecording of songs in english (the half-baked version of Tears is still played at the end of the concerts), then an album with only new songs where half of them are recycled (Rockstar, Hero, Beneath the Skin...). It would be called "X JAPAN", then it still has no name, then it would have Hyde and Marilyn Manson, then Taiji dies and became a member of the band again after dying, then it would be released on the X Day, then X Day was just another concert like every other since 2010.
There is so much confusing shit with X reunion that I don't believe in a new album anymore.