We already know that the new high level Dragons banish opposing cards after they have been summoned to the field and that they will gain even more Attack Points in the process. Additionally, the Structure Deck features a number of low level Warriors that help you summon high level Dragons. Not just the new dragons from the Structure Deck, but ANY high level Dragon.
The best card that will be released in the new Structure Deck is going to be a new Spell Card that can return any Level 7 or 8 Dragon from the graveyard. It doesn't have any additional restrictions and it can even protect the Dragon from destruction after it has been Special Summoned back to the field.
Just like the last few Structure Decks that have been released, Rise of the True Dragons contains 41 cards, among them 2 Ultra Rares, 3 Super Rares as well as 36 Commons.