One of Omega Ruby and Alpha Sapphire's more recently unveiled selling points is the ability to catch legendaries from other regions. This is done by flying into dark clouds via Latios or Latias - depending on which version you pick up - but that was the only details we had until now.
Above is a clip from Pokemon Get TV, a variety show in Japan, which goes into a little more depth. Thanks to our very own Tanis Pallagi's knowledge of the Japanese language, we can confirm that the image shown toward the end depicts which legendaries will appear in each version of the game.
Pokemon Omega Ruby:
This marks a huge break in tradition for the Pokemon series as no previous entry has granted access to the mascot legendaries from every generation. It's a welcome one though; fans have long lamented the constant need to transfer their previous game's legendaries up to complete the Pokedex, and this goes a long way in alleviating that issue.