According to MyAnimeList, the World Twinkle season has finished airing. But according to GoGoAnime, it's still ongoing.
I would have to guess that it has finished airing since episode 16 wasn't released on Thursday. There might be some special episodes coming up or they might be waiting for mais episodes, but I wouldn't hope too much. We'll just have to wait and see if something happens.
I don't think the season is finished yet. Maybe Hima is making a special episode or the series could be delayed due to the hetalia - axis powers musical that comes out on natal dia I believe. But Hima can't end the series now. It's too popular
Honestly, I agree that Hima probably got caught up with coordinating the musical. He hasn't updated the mangá on the encontro, data that he said he would and the seguinte episode was supposed to premier Feb. 9. There will deffinately be mais seasons to come- probably like two mais or so.