The versions of Zekrom ex and Reshiram ex revealed today have a new special rarity category, Black White Rare (BWR). This appears to be a one-off rarity category for this set, with the cards serving as representations of each set.
Translations of all cards revealed today from the new expansion, including reprints with new artwork, can be found below. These translations will be added to the Bulbapedia page for these paired expansions in due course. Other reprints utilizing existing artwork include a reprint of the Professor Juniper version of Professor's Research from the Generations Start Decks, and Energy Retrieval.
Black Bolt
SV11B 033/086 C
Tynamo HP: 40 
Basic
Hold Still
Heal 10 damage from this Pokémon.
Weakness: ×2
Resistance: None
Retreat: FreeSV11B 034/086 U
Eelektrik HP: 90
Stage 1 - Evolves from Tynamo
Ability: Dynamotor
Once during your turn, you may attach a Basic Energy card from your discard pile to 1 of your Benched Pokémon.
Electric Ball 50
Weakness: ×2
Resistance: None
Retreat:
(Translator's Note: This card is a reprint of the original Eelektrik card from 2011, just with new artwork and updated wording for its ability.)SV11B 035/086 U
Eelektross HP: 160
Stage 2 - Evolves from Eelektrik
Thunder Fang 60
Flip a coin. If heads, your opponent's Active Pokémon is now Paralyzed.
Buzz Flip 100×
Flip 4 coins. This attack does 100 damage for each heads.
Weakness: ×2
Resistance: None
Retreat: SV11B 082/086 U
Air Balloon
Trainer - Pokémon Tool
The Retreat Cost of the Pokémon this card is attached to is less.
(Translator's Note: This card is a reprint of the card from the Sword & Shield series, just with new artwork)SV11B 086/086 U
Prism Energy
Special Energy
As long as this card is attached to a Pokémon, it provides Energy.
If this card is attached to a Basic Pokémon, this card provides every type of Energy but provides only 1 Energy at a time.
(Translator's Note: This is a reprint of the Special Energy card originally released in Japan in 2011, only with new artwork and updated wording.)SV11B 174/086 BWR
Zekrom HP: 230
Basic
Slash 50
Voltage Burst 130+
This attack does 50 more damage for each prize card your opponent has taken. This Pokémon also does 30 damage to itself.
Weakness: ×2
Resistance: None
Retreat:
SV11W 072/086 C
Lillipup HP: 60
Basic
Play Rough 10+
Flip a coin. If heads, this attack does 20 more damage.
Weakness: ×2
Resistance: None
Retreat: SV11W 073/086 C
Herdier HP: 60
Stage 1 - Evolves from Lillipup
Roar
Switch out your opponent's Active Pokémon to the Bench. (Your opponent chooses the new Active Pokémon.)
Lunge Out 70
Weakness: ×2
Resistance: None
Retreat: SV11W 074/086 U
Herdier HP: 60
Stage 2 - Evolves from Herdier
Odor Sleuth
Flip 3 coins. Put a number of cards up to the number of heads from your discard pile into your hand.
Special Fang 100+
If this Pokémon has any Special Energy attached, this attack does 100 more damage
Weakness: ×2
Resistance: None
Retreat: SV11W 084/086 U
Cheren
Trainer - Supporter
Draw 3 cards
(Translators note: This card is a reprint of the supporter card originally printed in Japan in 2010, just with new artwork.)SV11W 085/086 U
Hilda
Trainer - Supporter
Search your deck for an Evolution Pokémon and an Energy card, reveal them, and put them into your hand. Then, shuffle your deck.SV11 086/086 U
Ignition Energy
Special Energy
If this card is attached to 1 of your Pokémon, discard it at the end of your turn.
As long as this card is attached to a Pokémon, it provides Energy.
If this card is attached to an Evolution Pokémon, it provides Energy.SV11W 174/086 BWR
Reshiram HP: 230
Basic
Slash 50
Blaze Burst 130+
This attack does 50 more damage for each prize card your opponent has taken. Discard an Energy from this Pokémon.
Weakness: ×2
Resistance: None
Retreat:
Promo Card
288/SV-P
Victini HP: 80
Basic
V Force 120
If you have 4 or fewer Benched Pokémon, this attack does nothing.
Weakness: ×2
Resistance: None
Retreat:
