Shapeshifters challenge

Hi,

Is shapeshifters over already? It's missing from daily/weekly challenges and from the store/shapeshifters tokens exchange. I didn't see any notice or info on the topic, it doesn't say anywhere until when this game mode is/was active.. now i have a few hundred tokens left and the players. 

Is it a bug, is it over/will it be back?h

ank you!