The upcoming Pokemon Omega Ruby and Pokemon Alpha Sapphire have been shrouded in mystery since their surprise reveal in May, and nothing has gotten fans talking more than the subtle new looks of the cover Pokemon, Groudon and Kyogre. While many have theorized that the covers depicted the mega evolutions of the legendary monsters, a post on the games' official website has revealed that they in fact portray a brand new type Pokemon form: Primal Reversion.

The page explained the new forms with a bit of Pokemon lore:

Long, long ago, there appeared in Hoenn two Pokémon of fearsome power. These two became known, in later times, as Groudon and Kyogre. When Groudon howled, the earth swelled and the land grew wide. The sun blazed overhead, and all the world around the creature was enveloped in incandescent heat. When Kyogre roared, water poured forth and the seas spread outward. Dark clouds enshrouded the world, and the deluge fell upon all...

It was a primal age, early in the world’s history. The natural world was overflowing with energy. That energy granted Groudon and Kyogre an overwhelming power. Seeking ever more of that energy for themselves, the two clashed again and again, and their battles cast the people and Pokémon of Hoenn into great danger. Brimming with the overwhelming power granted to them by nature’s energy, their transformation was named "Primal Reversion" by later people. And the people called their tormentors Primal Groudon and Primal Kyogre...

It seems these new forms will grant Kyogre and Groudon a significant boost in power, and perhaps some new abilities, but the specific effects have yet to be shared. It remains to be seen how, if at all, the new forms relate to the recently introduced mega evolution, or just how many Pokemon will be affected by Primal Reversion, but more details are sure to be revealed as the games' November 21 release date draws closer.