rexdart is right, it's going to be a long time before VantageScore replaces FICO, if it ever completely does. VantageScore will be on a different scale: 501 - 990. It roughly approximates the grades you would get in school:
901-990 equals "A" credit
801-900 equals "B" credit
701-800 equals "C" credit
601-700 equals "D" credit
501-600 equals "F" credit
More info at MoneyCentral