I didn't want to pay for the Japanese Black 2 which I couldn't understand, so I'm going to wait for the English release.
Last night I started a new game on Black for something to do, and when I tried to save before the first gym it said I had to erase the current save file at the title screen first! I was so angry; on the GBC/A games you can just save over the file, but it told me it was impossible to save, so now I have to redo the start of the game again. Not happy!