Obsidian Entertainment have announced that Pillars of Eternity II: Deadfire will arrive to the console market in 2019. And yes, that includes Switch as well.
This console release will include all DLC packs up to this point in time.
The statement that they've released is as follows: " If you read our last update, we promised to have more information regarding Deadfire's console release. As we stated, our partners at Grip Digital have been hard at work, and Deadfire will be releasing on the Xbox One, PlayStation 4, and Nintendo Switch in 2019! We are pleased to also announce that the console edition will ship with all expansions, updates, and free DLCs included at launch! We don't have an exact date for you yet, but as soon as we have one, we will let you know"!
The game was released on PC back in May and the current DLC (The Forget Sanctum) was released last week. So, now is definitely the right time to launch the game on consoles as well.