You know, I am not sure?
^_^;;; If you want my honest opinion, I think that (based on how the intro is almost identical, as is the ending with very superficial differences) Sony went up to the guys and said "HOLY CRAP! If we don't get something out there, no one will upgrade to 2.81 or 2.82 until AFTER we launch the PS3!
MAKE SOMETHING!
^_^ So they did.
o.o and honestly, it gave me the creeps a little.
Very spooky.
So I think that the "on a working game" may happen, or they may make demos for EVERY holiday and release "LocoRoco Yearly Loco", the seasonal game that changes based on the time of year.
One can dream.
********EDIT********
The method I suggested worked for me, but I will add yours also to the tutorial I am making
here. (with proper credit of course.). The benefit of doing it my way is that you can add your own icons and such along the way, but if it works who cares?