Diablo III: Reaper of Souls

Any word on how much longer Season 4's going to be?

I'd like to know the joy of Bane of the Stricken before they destroy Whirlwind. (I understand constanst Dust Devil generation is creating server lag, but still.....)

It was mentioned that PTR was expected to last until sometime in December. If this is true, it's likely to end before Christmas, since they usually do nothing during the holidays. Otherwise, it'll probably go until January when people get back to the office. Season 4 should end at around the same time, followed by a few weeks of no seasons, and then Season 5 should start.