Transferring GameCube development to the Wii was relatively simple, since the Wii was being created to be compatible with the GameCube.[o] At E3 2005, Nintendo released a small number of Nintendo DS game cards containing a preview trailer for Twilight Princess. They also announced that Zelda would appear on the Wii (then codenamed "Revolution"), but it was not clear to the media if this meant Twilight Princess or a different game.
Try to answer this question if possible (otherwise reply "unanswerable"): When did Nintendo announce Zelda would appear on the GameCube?
unanswerable