Ruling Does anyone know which sets will go out of the Format Constructed with new releases?

[Gyarados]

Mmm, basically thats my question, I really need to know which ones are the Sets that will remain in Constructed Deck Format * Modified ? its because I am building some decks for the tournaments, so i want them to be able to play as much as possible, Thank You!

 

[King Arceus]

Right now the format is Diamond and Pearl and newer. There is no confirmation of what will be legal after Worlds at this time.~Mark