(Also Spideyroxas states Europe gets them same day as well! UK look for them!!)
Freshly read from Kotaku
"Starting February 12 Pokémon Black and White players with access to a wireless connection will be able to download Mewtwo for a limited time, adding the psychic powerhouse to their pocket monster arsenal (as long as they have less than 11 Wonder Cards in their possession.
The special distribution event coincides with the debut of the Mewtwo-EX card in the Pokémon TCG: Black & White-Next Destinies expansion, due out February 8. The expansion features powerful Pokémon from Unova and beyond, including Reshiram-EX, Zekrom-EX, Kyurem-EX, and Regigigas-EX."So that means everyone get your DS's ready for distribution!!
As well as American or Eurpeon TCG collectors get ready to stalk your nearest card shops or Targets!!
Images taken from Serebii.net and Kotaku.
EDIT: Found them!