That may be but traditionally they update the PS Store on a set day each week, why would they change that for one demo? Especially when in America the demo came out the same day as the 360 demo. It's only Europe that is getting it 24 hours later, it's not as if one day makes a massive difference is it.
So why can't they add the demo one day earlier, since one day does not make a difference...
There is no good reason why they make users wait