From Yamamoto on the Coro Coro Pokespe site:
“On June 23rd, the first volume of PokeSP Sun Moon has finally released! Read it till the end. "Just what happened to Sun?!”
For those who can’t wait. CoroCoro Ichiban is on sale! It continues off in the August issue, so please do buy it and read it! For those worried about the release announcement of Pokemon "Ultra Sun Moon" in November and saying "What will happen to PokeSP?!“ Please enjoy Sun Moon arc first. “
USM might be its own arc? :o?