So, IT BEGINS.. On November 21st, 2014.
Trailers:
As for the versions name, I believe it's because Omega has as a metaphor to the pinnacle of evolution (The man appeared in Earth). Alpha is associated with creation (life came from the sea). Both combined mean the divine eternity. Probably a metaphor used to symbolize the eternal conflict between Earth and Ocean. In the case among the "gods" Groudon and Kyogre.
If we had a "third version" it could be like Gamma Emerald. It symbolizes longevity. In Rayquaza's Pokedex says it has hundreds of millions of years and the symbol on his head looks like a Y.