User blog comment:Kaido King of the Beasts/Chapter 783: Dead Men Get no Insurance/@comment-24769684-20150411175100

OK, so it seems as though people are citing three reasons for the hiatus: double issue, golden week, or oda just being a troll. The correct answer is Double Issue. As it was stated on the bottom of the last page of the chapter, Shonen Jump is releasing their double issue, meaning some chapters are being released next week and some (like OP) are being released the week after.

Golden Week is from April 29 to May 5, which if you look at the calendar is not next week.

Considering the plot twist, I wouldn't be surprised if it was oda just took a normal hiatus, since something as big as Gear 4 is going to take a lot of creativity, and I want gear 4 to be worth our time instead of just some half-assed power up.

Hopefully this will clear things up