User blog comment:Jopjopjop/Volume 19 Spoilers/@comment-174.52.115.52-20150517171108/@comment-24502975-20150517172309

There's still no confirmed release date for v20. I suspect that we'll get some info in 2-3 days, meaning v20 will most likely be out in July or August. Spoilers are out the day the volume is released (well, a day earlier for those of us in America).

All of those guesses are pretty valid. Anything can happen next volume tbh.