Just recently Shueisha published it's latest issue of Weekly Shonen Jump.
The update held an interview with Artist Togashi where he stated that the manga is far from over.
I need to finish writing the manga.
It has come to a point where either the story concludes first, or I die before that happens. But I do intend to finish it.
As a huge fan of the HXH series, this was nothing but music to my ears. Togashi might have given us the answer to the never ending question "When is Hunter X Hunter coming back?"
As of now there isn't an official confirmation about the series return but it's very likely that we will get to see at least one more season of this masterpiece.
2020 is a rough estimate. This section would be updated with more information of the series return by then.