So looking here:
It says "Cards appear throughout the day at the moment you need them.".
So as I need them means, if I enter the google now app or notice them when I pull down my notification bar? That's not really "appearing", is it?
I've had jb for a couple of weeks now and I did once get a package tracking notification, I see some sports scores, calendar appointments and restaurants, but nothing really revolutionary here like some people talk about it.
Is that all there is to it then?