Joeron on 21 February 2008
I believe in Smashburu X! Games with the letter X sell more (I just made that up)
FF XIII (dang it has an X too)
Japan prediction:
SSBB: 2.4 by the end of the year, lifetime 3 million
FFXIII: 2 million before the end of the year if ever. 2.6 lifetime