BGstuff
To grab the pics, just follow http://www.square-enix.co.jp/subaseka/i ... _3days.jpg , changing the 3 before days to whichever number. It seems they're adding the BG's individually every day, I guess to prevent spoilers?
I'd check to see if the BGM is changed, but from playing with URLs I haven't been able to find their location (they are being played through a .swf file)