Serebii.net has move information that was pre-programmed into Black and White, probably because of these sequels. They are the moves Freeze Shock and Ice Burn. Both of them are exactly like Sky Attack, except they are Ice-type moves. Freeze Shock hurls an electrically charged block of ice at the opponent, with a 30% chance of paralysis. Ice Burn charges, then releases an "ultracold, freezing wind (that) surrounds the target," with a 30% chance of burning the target.
Power-wise, they are identical to Sky Attack, being 140 power, 90 accuracy, needing a turn to charge, and having a 30% chance of an effect activating.
With these newly released photos, I speculate that Kyurem will learn these moves, probably at Lv. 100, like Reshiram and Zekrom learn Blue Flare and Bolt Strike, respectively. Moreover, Freeze Shock is a physical attack, and Ice Burn is a special attack. This further implies that Reshiram and Zekrom are part of this Kyurem because Zekrom is a powerful Physical attacker while Reshiram is a powerful Special attacker.
Here are the links:
Serebii.net BW Attackdex: Ice-type: http://www.serebii.net/attackdex-bw/ice.shtml
Serebii.net attackdex: Freeze Shock: http://www.serebii.net/attackdex-bw/freezeshock.shtml
Serebii.net Attackdex: Ice Burn:http://www.serebii.net/attackdex-bw/iceburn.shtml
Serebii.net Attackdex: Sky Attack: http://www.serebii.net/attackdex-bw/skyattack.shtml
Hopefully this will be true, but what else could it be?