If that leaked calendar is inaccurate then we're almost certainly not getting concrete info ahead of time, which has been standard practice by plarium 

Yup.  Sucks but seems likely.  Of course we can still take a good guess that a Titan event, a deck and a path will occur during the collab window. 

If that was pulled from the official game text published on the Google Play Store, but has not been officially announced anywhere else, it may still be correct and they just don't want it to be public yet, or it could actually be wrong.  Either way, someone in the Marketing Dept screwed up.

this is how I see it as well.