So far, there have been 97 updates, which were released on the following days of the week:
Monday: 18
Tuesday: 9
Wednesday: 14
Thursday: 16
Friday: 17
Saturday: 12
Sunday: 11
But to be fair, since 2.0, only 6 have been released on weekends 
I imagine we can expect the update at the beginning of next week.
Source: WoA Update Log