Japan's is next weekend with the deciding factor being Szechaun Sauce.
http://www.nintendoworldreport.com/news/45332/splatoon-2-flight-vs-invisibility-splatfest-results-announced
The second full Splatfest is in the books for North America and Europe, while Japan's has some advertising muscle next weekend.
Flight 2, Invisibility 1 (49-51, 55-45, 52-48) A far narrower popularity contest in the West saw Invisibility gain a small numbers advantage, but it wasn't enough to keep Flight from taking off with big victory margins. Although Marina's selections are 3-0 in popularity, Pearl has won all but one group of battles under the Splatoon 2 format including the pre-launch special.
Japan's next Splatfest will take place next weekend, and thanks to a sponsorship from McDonald's Japan will pit french fries (Pearl) against Chicken McNuggets (Marina) to determine the best fast food side dish.