It is not even in testing yet on the Beta server and Inno never gives advanced warning of a new chapter before it goes to Beta. Personally, I was expecting it to be on Beta by the beginning of this month, but I think all the tons of bugs the game has had over the past month or so pushed back the release. If you go back and look at the time in between chapter releases, the past 7 or 8 ranged from 6 to 8 months in between, and July will be about 8 months since chapter 19 was released.