The event isn't out until the 26th in Japan (the Coro Coro codes won't be active until then), the 29th in the UK (and only 15 initial people will get the Wonder Card (assuming they do it by Wonder Card and not by streetpassing from an official 3DS), the rest of the items will propogate by streetpass) and I don't know when the spread officially starts in the US but I doubt its before the 26th (and again the pool of people who get a wonder card instead of a street pass is limited though larger than the UK (looks like ~1000 people).
And the reason people want this so badly is that some of us live in places which have had absolutely no announcement of getting this and even if they did they'd probably never spread (I, for example, live in Australia, in the capital city of my state (the 3rd largest in the country), if you go and hang around the city centre or one of the universities you'll get ~5 Streetpasses (total) a day).