The promotional card for buying a box of either of the Japanese 'Freeze Bolt' or 'Cold Flare' expansion has been revealed. The two subsets will be released July 13. It is numbered 157/BW-P, and will be holofoil. It will appear with alternate artwork within the set. The Pokédex entry has been blurred out because it will come from Black 2 and White 2. A translation of the card is featured below.
Hit Points: 140
Sand Prison すなのかんごく
As long as this Pokémon is your Active Pokémon, place 1 damage counter on each of your opponent's Pokémon between turns.
Flying Beat フライングビート
You may discard both a Energy and a Energy from this Pokémon. If you do, the Defending Pokémon is now Paralyzed.