This has no official confirmation at this time.
Just in: A picture, supposedly of a Spanish-language Sneak Preview card list of Lord of the Tachyon Galaxy, has revealed a complete list of TCG and OCG additions to the set. For those who cannot see the post that is believed to be the initial release of this picture in the link above, here's the picture itself:
Assuming this picture is true, we can tell that the rumored list of OCG additions leaked earlier in the week is true as well. We can also see the names of every TCG Exclusive that has yet to be revealed, although in Spanish:
"LTGY-SP083 Sirenarmado Abisbalaen"
Can be translated as Mermail Abyssbaleen
"LTGY-SP085 Hada Fantasma Elfobia"
Can be translated as Mystical Ghost Elfobia
"LTGY-SP088 Libro de Magia de los Milagros"
Can be translated as Spellbook of Miracles
"LTGY-SP090 Explosion de los Cinco Hermanos"
Can be translated as Explosion of the Five Brothers
Another new Spellbook on top of the release of Spellbook of Judgment basically proves that Konami wants Prophecy to be the most powerful deck the game has possibly ever seen. Nobody knows why, but it's hard to imagine what other reason there could be for the deck to get support so consistently.
We can also postulate that Evilswarm, Constellars, and Dragon Rulers are coming out in full force this set - it seems rather unbelievable, but if this picture if true then there is no arguing anymore. And even harder to expect than that is yet another World Premiere Mermail card - what this card may mean for the (currently) murky future of this archetype if anybody's guess. What is not a mystery anymore though is the fact that this will be one of the most earth-shattering releases in the game's history - we knew it before, but we had no idea what we were in store for.
I will update this post or create new ones if or when more information is released. Thanks for reading!