Looks like this Rollercoaster may have come to an end.
https://s.famitsu.com/news/201709/24142632.html
From what I've gathered from Google Translate, it seems that Tabata and crew were just doing testing on whether the Luminous Engine or the Unreal Engine 4 would be a better fit to use for the Switch, but that somehow got translated as FFXV coming to Nintendo Switch.
In this article he says that there are currently no plans for FFXV on Switch.
He did say that UE4 performed well so there may be hope for other games from Square.
https://s.famitsu.com/news/201709/24142632.html
From what I've gathered from Google Translate, it seems that Tabata and crew were just doing testing on whether the Luminous Engine or the Unreal Engine 4 would be a better fit to use for the Switch, but that somehow got translated as FFXV coming to Nintendo Switch.
In this article he says that there are currently no plans for FFXV on Switch.
He acknowledges the discussion overseas about whether or not a Switch version is coming but confirms there are no plans at the mo.
Quick translation of the most important line:
ニンテンドースイッチに『FFXV』を出す計画は現状、ありません。しかしながら、ニンテンドースイッチは我々も好きなハードです。どういうものが作れるか、技術テストは行っています。
There are no Switch FF15 plans at the moment. However, we really like the system and have been testing out a few things to see what [kind of game] we want to make for it.
He did say that UE4 performed well so there may be hope for other games from Square.