Its legit. I checked the Korean translation and they left the Japanese text. It talks about about Act 3 ending soon. Pretty crazy how its lining up with a lot of our views about the Act structure. Act 3 ending soon indicates worldly updates about Sabo/Vivi/Hancock happening soon and also signifying most of the fights won't happen until Act 4. Act 3 mainly was Scabbard focused, which is good. Right now we are getting the "tragedy" or downfall of that plotline.
So next chapter is an Act 3 ending with scabbards going down is very possible and we might had a break week next chapter.
And we will get an updated news of what happen outside Wano