Like I do with all upcoming pokémon games, to make the game be understandable and surprising, I'm going to be waiting for the English version to be released next year. I'm not sure for some but I believe this makes the game more interesting, and a lot of the people who import the Japanese version are still yet more excited to get the English one.
I couldn't be troubled to waste money on both when I know I'll be enjoying the English pokémon black more, and the Japanese game will just sit in its case collecting dust. D;
It's definitely different for others (Especially if they can speak/read Japanese) no argument there, but for me I'd rather wait and see the exciting stories of others until it's released in the US.