They also had that for Halloween, at least on Live servers
My halloween box was for diamonds, also winter one diamonds too.
But from now on event passes will never be for diamonds anymore, just cash, the A/B testing seems to be over, I Guess.
With my comment I meant the event currency will be for money too, not only diamonds, event currency meaning stars, bowls, soccer balls, tickets, etc.
If they are opting just for cash and not be able to use diamonds in exhange for event currency will make diamonds usefull only for city expansions and GE/PvP arena tockens and GbG buildings accelerators, oh maybe building diamond supply buildings, but not for event anymore, so diamond farmers will not be able to use their other words to help their main get better buildings from better events like Wildlife, Fall. It can be a scenario but I wonder if this will happen 100%, but time will tell.
Also I have seen something interesting there, being able to buy cherry set pieces for cash, there will be some people out there that will buy such kits/set pieces if are for Fall Set wheat and ochre pieces, bang 3000$ boom 5000% attack stats, lol, no more playing the events and use event currency.