For most people, the English names for the new Pokémon in the upcoming Pokémon Black and White Versions is no secret at all. A few weeks ago, the list was leaked online and was regarded as a rumor until IGN released the names of several Pokémon, all of which matched the names on the list.
The list quickly spread around the Internet, appearing on sites like Pokébeach. Nintendo wasn’t happy that the list had gotten out, and many sites were forced to take it down. Serebii, who was legally obligated to keep the names a secret, was also angered by the leak.
However, these issues were soon forgotten when Serebii finally got the green light to reveal the names a few days ago, and has since updated his entire site with the names. The only names that weren’t revealed were the legendaries that are to be given out as events later on. Given Game Freak’s track record with naming legendaries, those names will probably be the same as the Japanese ones anyway.