Akihiro Hino has made this tweet where he comments on the current Yokai Watch anime ending today (30th of March), and a bit about the future of the series.
This is my translation of it:
"With today's anime, the story of Keita ends for now. But, Yokai Watch is not over. It will continue to go into many directions from here on out! Please enjoy Shadowside, starting in April, too!"
I find it interesting that this wording leaves open the possibility of returning to Keita (Nate) in the future, but I wouldn't see this as a "confirmation" that they will. We can't really say at this point.