Donald Mustard said on an interview in the day of the release of Clash Mob (12th april) that they were intending to release the new update with single player expansion in about 1 month or 1 month and a half.
1 month = 30 days (12th april until 12th may).
We are already at 17th may (+ 5 days). So, it is missing something around 10 days to the release of the new IB 2, isn't it?
1 month and a half = 45 days.