God Stone
This item is in the data of Pokemon Black and White. There's a stone for Zekrom, and there's a stone for Reshiram. Of course, this can be completely useless data (akin to D/P/Pt's Magma Stone or Loot Sack for example) or it can be evidence to a new Kyurem form.
And then the in-game legend that Kyurem is the remains/incomplete form of the dragon that was before Reshiram/Zekrom's split. As another member said before, Kyurem looks incomplete; the wings being different sized. Final piece of information - two hidden ice moves: Ice Burn and Freeze Shock. These can burn and paralyze respectively; similar to the other two dragon's dual signature moves.
Now these pieces of information are hypothesized that Kyurem (who's been speculated to be the third version mascot) will has another form. And then this excellent news source.
tl;dr - all information points to Kyurem getting SOMETHING in the new game; two moves are confirmed, and a new form looks better and better. Maddest of props to WPM, MeroMero, and Jade.