Account Migration has not begun. There will be an in game message when it's your turn to move. Do not fall for any third party websites that are telling you to migrate NOW. They're trying to steal your information.

@MojangSupport can you add to the minecraft eskimos who would live in an igloo and sell powdery snow etc (new version of villagers) and goat leather from which you could make goatskin armor which would warm the player when he was in powdery snow